616 cÂu trẮc nghiỆm chƯƠng i vl 11

8/4/2019 616 CU TRC NGHIM CHNG I VL 11

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CHNG I. IN TCH IN TRNG-T INCu 1.C hai in tch im q1v q2, chng y nhau. Khng nh no sau y lng.

A. q1> 0 v q2< 0. B. q1< 0 v q2> 0. C. q1.q2> 0. D. q1.q2< 0.Cu 2.C bn vt A, B, C, D kch thc nh, nhim in.Bit rng vt A ht vt B nhng li y C. Vt C ht vt D. Khng nh no sau y lkhng ng.

A. in tch ca vt A v D tri du. B. in tch ca vt A v D cng du.C. in tch ca vt B v D cng du.D. in tch ca vt A v C cng du.

Cu 3.Pht biu no sau y lng.A. Khi nhim in do tip xc, electron lun dch chuyn t vt nhim in sang vt khng nhim in. B. Khi nhim in do tip xc, electron lun dch chuyn t vt khng nhim in sang vt nhim in. C. Khi nhim in do hng ng, electron ch dch chuyn t u ny sang u kia ca vt b nhim in. D. Sau khi nhim in do hng ng, s phn b in tch trn vt b nhim in vn khng thay i.

Cu 4. ln ca lc tng tc gia hai in tch im trong khng khA. t l vi bnh phng khong cch gia hai in tch.B. t l vi khong cch gia hai in tch.C. t l nghch vi bnh phng khong cch gia hai in tch.D. t l nghch vi khong cch gia hai in tch.

Cu 5.Tng in tch dng v tng in tch m trong mt 1 cm3kh Hir iu kin tiu chun l.A. 4,3.103C v - 4,3.103C. B. 8,6.103C v - 8,6.103C.C. 4,3 C v - 4,3 C. D. 8,6 C v - 8,6 C.

Cu 6.Khong cch gia mt prton v mt lectron l r = 5.10-9cm, coi rng prton v lectron l cc in tch im. Lc tng tc gia chng l.A. lc ht vi F = 9,216.10-12N. B. lc y vi F = 9,216.10-12N.C. lc ht vi F = 9,216.10-8N. D. lc y vi F = 9,216.10-8N.

Cu 7.Hai in tch im bng nhau t trong chn khng cch nhau mt khong r = 2 cm. Lc y gia chng l F = 1,6.10 -4N. ln ca haiin tch l.

A. q1= q2= 2,67.10-9C. B. q1= q2= 2,67.10

-7CC. q1= q2= 2,67.10

-9C. D. q1= q2= 2,67.10-7C.

Cu 8.Hai in tch im bng nhau t trong chn khng cch nhau mt khong r1= 2 cm. Lc y gia chng l F1= 1,6.10-4N. lc tng tc

gia hai in tch bng F2= 2,5.10-4N th khong cch gia chng l.

A. r2= 1,6 m. B. r2= 1,6 cm. C. r2= 1,28 m. D. r2= 1,28 cm.Cu 9.Hai in tch im q1= +3C v q2= -3C,t trong du ( = 2) cch nhau mt khong r = 3 cm. Lc tng tc gia hai in tch l .

A. lc ht vi ln F = 45 N. B. lc y vi ln F = 45 N.C. lc ht vi ln F = 90 N. D. lc y vi ln F = 90 N.Cu 10.Hai in tch im bng nhau c t trong nc ( = 81) cch nhau 3cm. Lc y gia chng bng 0,2.10-5N. Hai in tch

A. tri du, ln l 4,472.10-2C. B. cng du, ln l 4,472.10-10C.C. tri du, ln l 4,025.10-9C. D. cng du, ln l 4,025.10-3C.

Cu 11.Hai qu cu nh c in tch 10-7C v 4.10-7C, tng tc vi nhau mt lc 0,1 N trong chn khng. Khong cch gia chng l. A. r = 0,6 cm. B. r = 0,6 m. C. r = 6 m. D. r = 6 cm.

Cu 12.C hai in tch q1= + 2.10-6C, q2= - 2.10

-6C, t ti hai im A, B trong chn khng v cch nhau mt khong 6 cm. Mt in tch q3= +2.10-6C, t trn ng trung trc ca AB, cch AB mt khong 4cm. ln ca lc in do hai in tch q 1v q2tc dng ln in tch q3l.

A. F = 14,40 N. B. F = 17,28 N. C.F = 20,36 N. D. F = 28,80 N.Cu 13.Pht biu no sau y lkhngng.

A. Ht lectron l ht c mang in tch m, c ln 1,6.10-19C.

B. Ht lectron l ht c khi lng m = 9,1.10-31kg.C. Nguyn t c thmt hoc nhn thm lectron tr thnh ion.D. lectron khng th chuyn ng t vt ny sang vt khc.

Cu 14.Pht biu no sau y lkhngng.A. Theo thuyt lectron, mt vt nhim in dng l vt thiu lectron.B. Theo thuyt lectron, mt vt nhim in m l vt tha lectron.C. Theo thuyt lectron, mt vt nhim in dng l vt nhn thm cc ion dng. D. Theo thuyt lectron, mt vt nhim in m l vt nhn thm lectron.

Cu 15.Pht bit no sau y lkhngng.A. Vt dn in l vt c cha nhiu in tch t do. B. Vt cch in l vt c cha rt t in tch t do.


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C. Vt dn in l vt c cha rt t in tch t do. D. Cht in mi l cht c cha rt t in tch t do.Cu 16.Pht biu no sau y lkhngng.

A. Trong qu trnh nhim in do c st, lectron chuyn t vt ny sang vt kia.B. Trong qu trnh nhim in do hng ng, vt b nhim in vn trung ho in.C. Khi cho mt vt nhim in dng tip xc vi mt vt cha nhim in, th lectron chuyn t vt cha nhim in sang vt nhim in

dng.D. Khi cho mt vt nhim in dng tip xc vi mt vt cha nhim in, th in tch dng chuyn t vt vt nhim in dng sang cha

nhim in.Cu 17.Khi a mt qu cu kim loi khng nhim in li gn mt qu cu khc nhim in th

A. hai qu cu y nhau. B. hai qu cu ht nhau.C. khng ht m cng khng y nhau. D. hai qu cu trao i in tch cho nhau.

Cu 18.Pht biu no sau y lkhngng.A. Trong vt dn in c rt nhiu in tch t do.B. Trong in mi c rt t in tch t do.C. Xt v ton b th mt vt nhim in do hng ng vn l mt vt trung ho in.D. Xt v ton b th mt vt nhim in do tip xc vn l mt vt trung ho in.

Cu 19.Pht biu no sau y lkhngng.A. in trng tnh l do cc ht mang in ng yn sinh ra.B. Tnh cht c bn ca in trng l n tc dng lc in ln in tch t trong n.C. Vct cng in trng ti mt im lun cng phng, cng chiu vi vect lc in tc dng ln mt in tch t ti im trong

in trng.D. Vct cng in trng ti mt im lun cng phng, cng chiu vi vect lc in tc dng ln mt in tch dng t ti im

trong in trng.Cu 20.tmt in tch dng, khi lng nh vo mt in trng u ri th nh. in tch s chuyn ng.

A. dc theo chiu ca ng sc in trng. B. ngc chiu ng sc in trng.C. vung gc vi ng sc in trng. D. theo mt qu o bt k.

Cu 21.t mt in tch m, khi lng nh vo mt in trng u ri th nh. in tch s chuyn ng.A. dc theo chiu ca ng sc in trng. B. ngc chiu ng sc in trng.C. vung gc vi ng sc in trng. D. theo mt qu o bt k.

Cu 22.Pht biu no sau y v tnh cht ca cc ng sc in l khngng.A. Ti mt im trong in tng ta c th v c mt ng sc i qua. B. Cc ng sc l cc ng cong khng kn.

C. Cc ng sc khng bao gi ct nhau.D. Cc ng sc in lun xut pht t in tch dng v kt thc in tch m.

Cu 23.Pht biu no sau y lkhngng.A. in ph cho ta bit s phn b cc ng sc trong in trng.B. Tt c cc ng sc u xut pht t in tch dng v kt thc in tch m.C. Cng c khi ng sc in khng xut pht t in tch dng m xut pht t v cng. D. Cc ng sc ca in trng u l cc ng thng song song v cch u nhau.

Cu 24.Cng thc xc nh cng in trng gy ra bi in tch Q < 0, ti mt im trong chn khng, cch in tch Q mt khong r l.

A.9

2

QE 9.10

r B. 9

2

QE 9.10

r C. 9

QE 9.10

r D. 9

QE 9.10

r

Cu 25.Mt in tch t ti im c cng in trng 0,16V/m. Lc tc dng ln in tch bng 2.10 -4N. ln in tch l.

A. q = 8.10-6

C. B. q = 12,5.10-6

C.C. q = 8C. D. q = 12,5C.Cu 26.Cng in trng gy ra bi in tch Q = 5.10-9C, ti mt im trong chn khng cch in tch mt khong 10 cm c ln l.

A. E = 0,450 V/m. B. E = 0,225 V/m. C. E = 4500 V/m. D. E = 2250 V/m.Cu 27.Ba in tch q ging ht nhau c t c nh tiba nh ca mt tam gic u c cnh a. ln cng in trng ti tm ca tamgic l.

A.9

2

QE 9.10

a B. 9

2

QE 3.9.10

a C. 9

2

QE 9.9.10

a D. E = 0.

Cu 28.Hai in tch q1= 5.10-9C, q2= - 5.10

-9C t ti hai im cch nhau 10 cm trong chn khng. ln cng in trng ti im nmtrn ng thng i qua hai in tch v cch u hai in tch l.


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A. E = 18000 V/m. B. E = 36000 V/m. C. E = 1,800 V/m. D. E = 0 V/m.Cu 29.Hai in tch q1= q2= 5.10

-16C, t ti hai nh B v C ca mt tam gic u ABC cnh bng 8 cm trong khng kh. Cng in trngti nh A ca tam gic ABC c ln l.

A. E = 1,2178.10-3V/m. B. E = 0,6089.10-3V/m.C. E = 0,3515.10-3V/m. D. E = 0,7031.10-3V/m.

Cu 30.Hai in tch q1= 5.10-9C, q2= - 5.10

-9C t ti hai im cch nhau 10 cm trong chn khng. ln cng in trng ti im nmtrn ng thng i qua hai in tch v cch q15 cm, cch q215 cm l.

A. E = 16000 V/m. B. E = 20000 V/m. C. E = 1,600 V/m. D. E = 2,000 V/m.Cu 31.Hai in tch q1= 5.10-16C, q2= - 5.10-16C, t ti hai nh B v C ca mt tam gic u ABC cnh bng 8 cm trong khng kh. Cng in trng ti nh A ca tam gic ABC c ln l.

A. E = 1,2178.10-3V/m. B. E = 0,6089.10-3V/m. C. E = 0,3515.10-3V/m. D. E = 0,7031.10-3V/m.Cu 32.Cho hai in tch dng q1= 2 nC v q2= 0,018C t c nh v cch nhau 10 cm. t thm in tch th ba q0ti mt im trn ngni hai in tch q1, q2sao cho q0nm cn bng. V tr ca q0l

A. cch q12,5cm v cch q27,5cm. B. cch q17,5cm v cch q22,5cm.C. cch q12,5cm v cch q212,5cm. D. cch q112,5cm v cch q22,5cm.

Cu 33.Hai in tch im q1= 2.10-2C v q2= - 2.10

-2C t ti hai im A v B cch nhau mt on a=30 cm trong khng kh. Lc in tcdng ln in tch q0= 2.10

-9C t ti im M cch u A v B mt khong bng a c ln l.A. F = 4.10-10N. B. F = 3,464.10-6N. C. F = 4.10-6N. D. F = 6,928.10-6N.

Cu 34.Hai in tch im q1= 0,5nC v q2= -0,5nC t ti hai im A, B cch nhau 6cm trong khng kh. Cng in trng ti trung im

ca AB c ln l.A. E = 0V/m. B. E = 5000V/m. C. E = 10000V/m. D. E = 20000V/m.Cu 35.Hai in tch im q1= 0,5nC v q2= -0,5nC t ti hai im A, B cch nhau 6cm trong khng kh. Cng in trng ti im M nmtrn trung trc ca AB, cch trung im ca AB mt khong l = 4cm c ln l.

A. E = 0V/m. B. E = 1080V/m. C. E = 1800V/m. D. E = 2160V/m.Cu 36.Cho hai bn kim loi phng t song song tch in tri du, mt lectron bay vo in trng gi hai bn kim loi ni trn, vi vn tc banu v0vung gc vi cc ng sc in. B qua tc dng ca trong trng. Qu o ca lectron l.

A. ng thng song song vi cc ng sc in. B. ng thng vung gc vi cc ng sc in.C. mt phn ca ng hypebol. D. mt phn ca ng parabol.

Cu 37.Cho hai bn kim loi phng t song song tch in tri du, th mt lectron khng vn tc ban u vo in trng gi hai bn kim loitrn. B qua tc dng ca trng trng. Qu o ca lectron l.

A. ng thng song song vi cc ng sc in. B. ng thng vung gc vi cc ng sc in.

C. mt phn ca ng hypebol. D. mt phn ca ng parabol.Cu 38.Mt in tch q = 10-7C t ti im M trong in trng ca mt in tch im Q, chu tc dng ca lc F = 3.10-3N. Cng intrng do in tch im Q gy ra ti im M c ln l.

A. EM= 3.105V/m. B. EM= 3.10

4V/m. C. EM= 3.103V/m. D. EM= 3.10

2V/m.Cu 39.Mt in tch im dng Q trong chn khng gy ra ti im M cch in tch mt khong r=30cm, mt in trng c cng E =30000V/m. ln in tchQ l.

A. Q = 3.10-5C. B. Q = 3.10-6C. C. Q = 3.10-7C. D. Q = 3.10-8C.Cu 40.Hai in tch im q1 = 2.10

-2C v q2 = - 2.10-2C t ti hai im A v B cch nhau mt on a=30 cm trong khng kh. Cng

in trng ti im M cch u A v B mt khong bng a c ln l. A. EM= 0,2V/m. B. EM= 1732V/m. C. EM= 3464V/m. D. EM= 2000V/m

Cu 41.Cng thc xc nh cng ca lc in trng lm dch chuyn in tch q trong in trng u E l A = qEd, trong d l.A. khong cch gia im u v im cui.

B. khong cch gia hnh chiu im u v hnh chiu im cui ln mt ng sc.C. di i s ca on t hnh chiu im u n hnh chiu im cui ln mt ng sc, tnh theo chiu ng sc in. D. di i s ca on t hnh chiu im u n hnh chiu im cui ln mt ng sc.

Cu 42.Pht biu no sau y lkhngng.A. Cng ca lc in tc dng ln mt in tch khng ph thuc vo dng ng i ca in tch m ch ph thuc vo v tr im u v im

cui ca on ng i trong in trng.B. Hiu in th gia hai im trong in trng l i lng c trng cho kh nng sinh cng ca in trng lm dch chuyn in tch gia

hai im .C. Hiu in th gia hai im trong in trng l i lng c trng cho in trng tc dng lc mnh hay yu khi t in tch th ti hai

im .D. in trng tnh l mt trng th.


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Cu 43.Mi lin h gia hiu in th UMNv hiu in th UNMl.

A. UMN= UNM. B. UMN= - UNM. C. UMN=NMU

1. D. UMN=

NMU

1 .

Cu 44.Hai im M v N nm trn cng mt ng sc ca mt in trng u c cng E, hiu in th gia M v N l UMN, khong cchMN = d. Cng thc no sau y lkhngng.

A. UMN= VMVN. B. UMN= E.d C. AMN= q.UMN D. E = UMN.dCu 45.Mt in tch q chuyn ng trong in trng khng u theo mt ng cong kn. Gi cng ca lc in trong chuyn ng l A th

A. A > 0 nu q > 0. D. A = 0 trong mi trng hp.B. A > 0 nu q < 0. C. A 0 cn du ca A cha xc nh v cha bit chiu chuyn ng ca q.

Cu 46.Hai tm kim loi song song, cch nhau 2cm v c nhim in tri du nhau. Mun lm cho in tch q = 5.10-10C di chuyn t tm nyn tm kia cn tn mt cng A = 2.10-9J. Coi in trng bn trong khong gia hai tm kim loi l in trng u v c cc ng sc invung gc vi cc tm. Cng in trng bn trong tm kim loi l.

A. E = 2 V/m. B. E = 40 V/m. C. E = 200 V/m. D. E = 400 V/m.Cu 47.Mt lectron chuyn ng dc theo ng sc ca mt in trng u. Cng in trng E=100V/m. Vn tc ban u ca lect ron

bng 300km/s. Khi lng ca lectron l m = 9,1.10-31kg. T lc bt u chuyn ng n lc vn tc ca lectron bng khng th lectron chuynng c qung ng l.

A. S = 5,12 mm.B. S = 2,56 mm. C. S = 5,12.10-3mm. D. S = 2,56.10-3mm.Cu 48.Hiu in th gia hai im M v N l UMN= 1V. Cng ca in trng lm dch chuyn in tch q=- 1C t M n N l.

A. A = - 1 J. B. A = + 1 J. C. A = - 1J. D. A = + 1J.Cu 49.Mt qu cu nh khi lng 3,06.10-15kg, mang in tch 4,8.10-18C, nm l lng gia hai tm kim loi song song nm ngang nhim intri du, cch nhau mt khong 2cm. Ly g = 10m/s2. Hiu in th t vo hai tm kim loi l.

A. U = 255V. B. U = 127,5V. C. U = 63,75V. D. U = 734,4V.Cu 50.Cng ca lc in trng lm di chuyn mt in tch gia hai im c hiu in th U = 2000 V l A = 1 J. ln ca in tch l

A. q = 2.10-4C. B. q = 2.10-4C. C. q = 5.10-4C. D. q = 5.10-4C.

Cu 51.Mt in tch q = 1C di chuyn t im A n im B trong in trng, n thu c mt nng lng W = 0,2mJ. Hiu in th giahai im A, B l.

A. U = 0,20V. B. U = 0,20mV. C. U = 200kV. D. U = 200V.Cu 52.Pht biu no sau y i vi vt dn cn bng in lkhngng.

A. Cng in trng trong vt dn bng khng.B. Vect cng in trng b mt vt dn lun vung gc vi b mt vt dn.

C. in tch ca vt dn ch phn b trn b mt vt dn.D. in tch ca vt dn lun phn b u trn b mt vt dn.Cu 53.Gi s ngi ta lm cho mt s lectron t do t mt ming st vn trung ho in di chuyn sang vt khc. Khi

A. b mt ming st vn trung ho in. B. b mt ming st nhim in dng.C. b mt ming st nhim in m. D. trong lng ming st nhim in dng.

Cu 54.Pht biu no sau y lkhngng.A. Khi a mt vt nhim in dng li gn mt qu cu bc th qu cu bc b ht v pha vt nhim in dng. B. Khi a mt vt nhim in m li gn mt qu cu bc th qu cu bc b ht v pha vt nhim in m. C. Khi a mt vt nhim in m li gn mt qu cu bc (in mi) th qu cu bc b y ra xa vt nhim in m. D. Khi a mt vt nhim in li gn mt qu cu bc th qu cu bc b ht v pha vt nhim in.

Cu 55.Mt qu cu nhm rng c nhim in th in tch ca qu cuA. ch phn b mt trong ca qu cu.

B. ch phn b mt ngoi ca qu cu.C. phn b c mt trong v mt ngoi ca qu cu.D. phn b mt trong nu qu cu nhim in dng, mt ngoi nu qu cu nhim in m.

Cu 56.Pht biu no sau y lng.A. Mt vt dn nhim in dng th in tch lun lun c phn b u trn b mt vt dn.B. Mt qu cu bng ng nhim in m th vect cng in trng ti im bt k bn trong qu cu c hng v tm qu cu. C. Vect cng in trng ti mt im bn ngoi vt nhim in lun c phng vung gc vi mt vt .D. in tch mt ngoi ca mt qu cu kim loi nhim in c phn b nh nhau mi im.

Cu 57.Haiqu cu bng kim loi c bn knh nh nhau, mang in tch cng du. Mt qu cu c, mt qu cu rng. Ta cho hai qu cu tip xcvi nhau th

A. in tch ca hai qu cu bng nhau.


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B. in tch ca qu cu c ln hn in tch ca qu cu rng.C. in tch ca qu cu rng ln hn in tch ca qu cu c.D. hai qu cu u tr thnh trung ho in.

Cu 58.a mt ci a nhim in li gn nhng mu giy nh, ta thy mu giy b ht v pha a. Sau khi chm vo a th A. mu giy cng b ht cht vo a.B. mu giy b nhim in tch tri du vi a.C. mu giy b tr ln trung ho in nn b a y ra.D. mu giy li b y ra khi a do nhim in cng du vi a.

Cu 59.Pht biu no sau y lkhngng.A. T in l mt h hai vt dn t gn nhau nhng khng tip xc vi nhau. Mi vt gi l mt bn t.B. T in phng l t in c hai bn t l hai tm kim loi c kch thc ln t i din vi nhau.C. in dung ca t in l i lng c trng cho kh nng tch in ca t in v c o bng thng s gia in tch ca t v hiu in

th gia hai bn t.D. Hiu in th gii hn l hiu in th ln nht t vo hai bn t in m lp in mi ca t in b nh thng.

Cu 60.in dung ca t in khng ph thuc vo.A. Hnh dng, kch thc ca hai bn t. B. Khong cch gia hai bn t.C. Bn cht ca hai bn t. D. Cht in mi gia hai bn t.

Cu 61.Mt t in phng gm hai bn t c din tch phn i din l S, khong cch gia hai bn t l d, lp in mi c hng s in mi , indung c tnh theo cng thc.

A. d2.10.9SC 9

B. 9SC 9.10 .4 d

C. d4.

S.10.9C

9

D. d4

S10.9C

9

Cu 62.Mt t in phng, gi nguyn din tch i din gia haibn t, tng khong cch gia hai bn t ln hai ln thA. in dung ca t in khng thay i. B. in dung ca t in tng ln hai ln.C. in dung ca t in gim i hai ln. D. in dung ca t in tng ln bn ln.

Cu 63.Bn t in ging nhau c in dung C c ghp ni tip vi nhau thnh mt b t in. in dung ca b t in l.

A. Cb= 4C. B. Cb=C

4. C. Cb= 2C. D. Cb=

C

2.

Cu 64.Bn t in ging nhau c in dung C c ghp song song vi nhau thnh mt b t in. in dung ca b t in l.

A. Cb= 4C. B. Cb=C

4. C. Cb= 2C. D. Cb=

C

2.

Cu 65.Mt t in c in dung 500pF c mc vo hiu in th 100 V. in tch ca t in l. A. q = 5.104C. B. q = 5.104nC. C. q = 5.10-2C. D. q = 5.10-4C.

Cu 66.Mt t in phng gm hai bn c dng hnh trn bn knh 3 cm, t cch nhau 2 cm trong khng kh. in dung ca t in l.A. C = 1,25pF. B. C = 1,25 nF.C. C = 1,25F. D. C = 1,25 F.

Cu 67.Mt t in phng gm hai bn c dng hnh trn bn knh 5 cm, t cch nhau 2 cm trong khng kh. in trng nh thng i vikhng kh l 3.105V/m. Hiu in th ln nht c th t vo hai bn cc ca t in l.

A. Umax= 3000 V. B. Umax= 6000 V. C. Umax= 15.103V. D. Umax= 6.10

5V.Cu 68.Mt t in phng c mc vo hai cc ca mt ngun in c hiu in th 50V. Ngt t in ra khi ngun ri ko cho khong cchgia hai bn t tng gp hai ln th

A. in dung ca t in khng thay i. B. in dung ca t in tng ln hai ln.C. in dung ca t in gim i hai ln. D. in dung ca t in tng ln bn ln.

Cu 69.Mt t in phng c mc vo hai cc ca mt ngun in c hiu in th 50V. Ngt t in ra khi ngun ri ko cho khong cchgia hai bn t tng gp hai ln thA. in tch ca t in khng thay i. B. in tch ca t in tng ln hai ln.C. in tch ca t in gim i hai ln. D. in tch ca t in tng ln bn ln.

Cu 70.Mt t in phng c mc vo hai cc ca mt ngun in c hiu in th 50 V. Ngt t in ra khi ngun ri ko cho khon g cchgia hai bn t tng gp hai ln th hiuin th gia hai bn t c gi tr.

A. U = 50V. B. U = 100V. C. U = 150V. D. U = 200V.Cu 71.Hai t in c in dung C1= 0,4F, C2= 0,6F ghp song song vi nhau. Mc b t in vo ngun in c hiu in th U < 60 Vth mt trong hai t in c in tch bng 3.10-5C. Hiu in th ca ngun in l.

A. U = 75V. B. U = 50V. C. U = 7,5.10-5V. D. U = 5.10-4V.


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6

Cu 72.B t in gm ba t in. C1= 10F, C2= 15F, C3= 30F mc ni tip vi nhau. in dung ca b t in l.A. Cb= 5F. B. Cb= 10F. C. Cb= 15F. D. Cb= 55F.

Cu 73.B t in gm ba t in. C1= 10F, C2= 15F, C3= 30F mc song song vi nhau. in dung ca b t in l.

A. Cb= 5F. B. Cb= 10F. C. Cb= 15F. D. Cb= 55F.Cu 74.B t in gm hai t in. C1= 20F, C2= 30F mc ni tip vi nhau, ri mc vo hai cc ca ngun in c hiu in th U = 60V.in tch ca b t in l.

A. Qb= 3.10-3C. B. Qb= 1,2.10

-3C. C. Qb= 1,8.10-3C. D. Qb= 7,2.10

-4C.Cu 75.B t in gm hai t in. C1= 20F, C2= 30F mc ni tip vi nhau, ri mc vo hai cc ca ngun in c hiu in th U = 60 V.in tch ca mi t in l.

A. Q1= 3.10-3C v Q2= 3.10

-3C. B. Q1= 1,2.10-3C v Q2= 1,8.10

-3C.C. Q1= 1,8.10

-3C v Q2= 1,2.10-3C D. Q1= 7,2.10

-4C v Q2= 7,2.10-4C.

Cu 76.B t in gm hai t in. C1= 20F, C2= 30F mc ni tip vi nhau, ri mc vo hai cc ca ngun in c hiu in th U = 60 V.Hiu in th trn mi t in l.

A. U1= 60V v U2= 60V. B. U1= 15V v U2= 45V.C. U1= 45V v U2= 15V. D. U1= 30 V v U2= 30V.

Cu 77.B t in gm hai t in. C1= 20F, C2 = 30F mc song song vi nhau, ri mc vo hai cc ca ngun in c hiu in th U =60V. Hiu in th trn mi t in l.

A. U1= 60V v U2= 60V. B. U1= 15V v U2= 45V.

C. U1= 45V v U2= 15V. D. U1= 30V v U2= 30V.Cu 78.B t in gm hai t in. C1= 20F, C2= 30F mc song song vi nhau, ri mc vo hai cc ca ngun in c hiu in th U = 60V. in tch ca mi t in l.

A. Q1= 3.10-3C v Q2= 3.10

-3C. B. Q1= 1,2.10-3C v Q2= 1,8.10

-3C.C. Q1= 1,8.10

-3C v Q2= 1,2.10-3C D. Q1= 7,2.10

-4C v Q2= 7,2.10-4C.

Cu 79.Hai bn ca mt t in phng l hnh trn, t in c tch in sao cho in trng trong t in bng E = 3.105V/m. Khi in tch cat in l Q = 100 nC. Lp in mi bn trong t in l khng kh. Bn knh ca cc bn t l.

A. R = 11cm. B. R = 22cm. C. R = 11m. D. R = 22m.Cu 80.C hai t in. t in 1 c in dung C1= 3F tch in n hiu in th U1= 300V, t in 2 c in dung C2= 2F tch in n hiuin th U2= 200V. Ni hai bn mang in tch cng tn ca hai t in vi nhau. Hiu in th gia cc bn t in l.

A. U = 200V. B. U = 260V. C. U = 300V. D. U = 500V.Cu 81.C hai t in. t in 1 c in dung C1= 3F tch in n hiu in th U1= 300V, t in 2 c in dung C2= 2F tch in n hiuin th U2=200V. Ni hai bn mang in tch cng tn ca hai t in vi nhau. Nhit lng to ra sau khi ni l.

A. 175 mJ. B. 169.10-3J. C. 6 mJ. D. 6 J.Cu 82.Mt b t in gm 10 t in ging nhau mi t c in dung C = 8F ghp ni tip vi nhau. B t in c ni vi hiu in thkhng i U = 150V. bin thin nng lng ca b t in sau khi c mt t in b nh thng l.

A. W = 9 mJ. B. W = 10 mJ. C. W = 19 mJ. D. W = 1 mJ.Cu 83.Mt t in phngc in dung C, c mc vo mt ngun in, sau ngt khi ngun in. Ngi ta nhng hon ton t in vo chtin mi c hng s in mi . Khi in tch ca t in

A. Khng thay i. B. Tng ln ln. C. Gim i ln. D. Thay i ln.Cu 84.Mt t in phng c in dung C, c mc vo mt ngun in, sau ngt khi ngun in. Ngi ta nhng hon ton t in vo chtin mi c hng s in mi . Khi in dung ca t in

A. Khng thay i. B. Tng ln ln.

C. Gim i ln. D. Tng ln hoc gim i tu thuc vo lp in mi.Cu 85.Mt t in phng c in dung C, c mcvo mt ngun in, sau ngt khi ngun in. Ngi ta nhng hon ton t in vo chtin mi c hng s in mi . Khi hiu in th gia hai bn t in

A. Khng thay i. B. Tng ln ln.C. Gim i ln. D. Tng ln hoc gim i tu thuc vo lp in mi.

Cu 86.biu no sau y lng.A. Sau khi np in, t in c nng lng, nng lng tn ti di dng ho nng.B. Sau khi np in, t in c nnglng, nng lng tn ti di dng c nng.C. Sau khi np in, t in c nng lng, nng lng tn ti di dng nhit nng.D. Sau khi np in, t in c nng lng, nng lng l nng lng ca in trng trong t in.


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7

Cu 87.Mt tin c in dung C, c np in n hiu in th U, in tch ca t l Q. Cng thc no sau y khng phi l cng thc xcnh nng lng ca t in.

A. W =C

Q

2

12

B. W =2

1 U

2 CC. W = 2CU

2

1D. W = QU

2

1

Cu 88.Mt t in c in dung C, c np in n hiu in th U, in tch ca t l Q. Cng thc xc nh mt nng lng in trngtrong t in l.

A. w = C

Q

2

1 2

B. w = 2CU2

1C. w = QU2

1 D. w =

2

9

E

9.10 .8

Cu 89.Mt t in c in dung C = 6F c mc vo ngun in 100V. Sau khi ngt t in khi ngun, do c qu trnh phng in qua lpin mi nn t in mt dn in tch. Nhit lng to ra trong lp in mi k t khi bt u ngt t in khi ngun in n khi t phng ht inl.

A. 0,3 mJ. B. 30kJ. C. 30 mJ. D. 3.104J.Cu 90.Mt t in c in dung C = 5 F c tch in, in tch ca t in bng 10-3C. Ni t in vo b acquy sut in ng 80V, bnin tch dng ni vi cc dng, bn in tch m ni vi cc m ca b acquy. Sau khi cn bng in th

A. nng lng ca b acquy tng ln mt lng 84 mJ.B. nng lng ca b acquy gim i mt lng 84 mJ.C. nng lng ca b acquy tng ln mt lng 84 kJ.D. nng lng ca b acquy gim i mt lng 84 kJ.

Cu 91.Mt t in khng kh phng mc vo ngun in c hiu in th U=200V. Hai bn t cch nhau 4 mm. Mt nng lng in trngtrong t in l.

A. w = 1,105.10-8J/m3. B. w = 11,05mJ/m3.C. w = 8,842.10-8J/m3. D. w = 88,42mJ/m3.Cu 92.Hiu in th gia hai im trong in trng c tr s bng cng ca lc in khi i chuyn

A. mt n v in tch dng gia hai im ny.B. mt in tch bt k gia hai im ny.C mt n v in tch m gia hai im ny.D. mt n v in tch dng dc theo sut mt ng khp kn i qua hai im ny.

Cu 93.Mi lin h gia hiu in th UMNv hiu in th UNMl.

A. UMN= UNM. B.UMN= -UNM. C. UMN=NM

1

U. D. UMN= -

NM

1

U.

Cu 94.Mt in tch q = l0-6

C di chuyn t im A n im B trong mt in trng u. Cng ca lc in trng thc hin l 2.10-4

J. Hiu inth gia hai im A v B c gi tr no sau y .A. 20V. B. -20V. C. 200V. D. -200V.

Cu 95.Cng ca lc in trng lm di chuyn mt in tch gia hai im c hiu in th U = 2000 V l A= 1 J. ln ca in tch lA.q = 5.10-4C. B. q = 5.10-4C. C.q = 2.10-4C. D.q = 2.10-4C.

Cu 96.Mt ht mang in dng di chuyn t M n N trn mt ng sc ca mt in trng u th c ng nng tng. Kt qu ny cho thy.

A. VM< VN. B. in trng c chiu t M n N.C. in trng to cng m. D. C ba iu trn.

Cu 97.Mt electron di chuyn t M n N trn mt ng sc ca mt in trng u th c ng nng gim. Kt qu ny cho thy .

A. VM> VN. B. intrng c chiu t M n N.C. in trng to cng m. D. C ba iu trn.Cu 98.Cho b t c s nh hnh , trong cc t in c in dung C bng nhau. Bit UMB =4V. Hiu in th UABc gi tr

A. 20V. B. 16V. C. 12V. D. 8VCu 99.Trong khng kh lun lun c nhng in t do. Nu thit lp mt in trng trong khngkh th in trng ny s lm cho cc in di chuyn nh th no .

A. In m s di chuyn t im c in th cao n im c in th thp. B. In m s di chuyn t im c in th thp n im c in th cao.C. In dng s di chuyn t im c in th thp n im c in th cao.

C C

C C

MNA +

B -


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8

D. Cc in s khng dch chuyn.Cu 100.Mt in tch q = 2.10-5C di chuyn t mt im M c in th VM= 10V n im N c in th VN= 4V. N cch M 5cm. Cng calc in l

A. 10-6J. B. 2.10-4J. C. 8.10-5J. D. 12.10-5J.Cu 101. Mt in tch q = 2.10-5C di chuyn t mt im M c in th VM = 4V n im N c in thVN= 12V. N cch M 5cm. Cng ca lc in l

A. 10-6J. B. -1,6.10-4J. C. 8.10-5J. D. -2,4.10-4J.Cu 102. Mt lectron bay t im M n im N trong mt in trng, gia hai im c hiu in thUMN= l00V. Bit 1eV = 1,6.10-19J. Cng m lc in sinh ra s l .

A. + 1,6. l0-19J B.1,6.l0-19J C. + 100 eV D.100eV.Cu 103.Mt lectron di chuyn mt on ng 1cm, ngc chiu in trng dc theo mt ng sc trong mt in trng u c cng in trng 1000V/m. Cng ca lc in c gi tr.

A. -1,6.10-16J. B. -1,6.10-18J. C. +1,6.10-16J. D. +1,6.10-18J.Cu 103.Gi VM, VNl in th ti cc im M, N trong in trng. Cng AMNca lc in trng khi in tch q di chuyn t M n N l.

A. AMN= q(VMVN). B. AMN=NM VV

q

-

. C. AMN= q(VM+ VN). D. AMN=q

VV NM -.

Cu 104.Vi vt dn cn bng in, pht biu no sau y lkhngng.A. Khi mt vt dn b nhim in th cng in trng trong vt dn khc khng.B. Khi vt dn t trong in trng th in th ti mi im trong vt dn u bng nhau.

C. Cng in trng ti mt im trn mt ngoi vt dn lun vung gc vi mt vt.D. Vt dn b nhim in th in tch ch phn b trn b mt ngoi ca vt.

Cu 105.T in c cu to gmA. mt vt c th tch in c.B. mt vt bng kim loi m c th lm cho hai u ca n mang in tri du. C. hai tm nha t gn nhau c th c tch in tri du vi ln bng nhau. D. hai vt bng kim loi t gn nhau v gia chng l cht cch in.

Cu 106.i lng no c trng cho kh nng tch in ca mt t in .A. in tch ca t in B. Hiu in th gia hai bn ca t inC. Cng in trng trong t in. D. in dung ca t in.

Cu 4.Chn cu pht biung.A. in dung ca t in t l vi in tch ca n.

B. in tch ca t in t l vi hiu in th gia hai bn ca n.C. Hiu in th gia hai bn t in t l vi in dung ca n.D. in dung ca t in t l nghch vi hiu in th gia hai bn ca n.

Cu 107.C 4 tC1= 3F, C2= 6F, C3= C4= 1F c mc nh hnh v. Lp gia hai u bt mt hiu in th U = 12V. in tch ca cc t C1, C2c gi tr nh sau .

A. Q1= 36C, Q2= 72C B. Q1= Q2= 36CC. Q1= Q2= 12C D. Q1= Q2= 24C.

Cu 108.Chn cu pht biu ng. Hai t in cha cng mt in tch th .A. Hai t in phi c cng in dung.B. Hiu in th gia hai bn ca mi t in phi bng nhau.C. T in c in dung ln s c hiu in th gia hai bn ln.D. T in c in dung ln s c hiu in th gia hai bn nh.

Cu 109.Chn cung. Khi mt t in phng tch in th .A. hai bn t nhim in cng du.B. in trng gia hai bn t l in trng u.C. ng sc in trng trong khng gian gia hai bn t l nhng ng thng song song vi cc bn t.D. c th coi in tch ca t bng 0 v hai bn t nhim in tri du v c tr s tuyt i bng nhau.

Cu 110.Chn cu pht biung.. Xt mi quan h gia in dung C v hiu in th ti a Umaxc th t gia hai bn ca mt t inphng khng kh. Gi Sl din tch cc bn, d l khong cch gia hai bn.

A. Vi S nh nhau, C cng ln th Umaxcng ln. B. Vi S nh nhau, C cng ln th Umaxcng nh.C. Vi d nh nhau, C cng ln th Umaxcng ln. D. Vi d nh nhau, C cng ln th Umaxcng nh.

Cu 8.Mt t phng khng kh c tch in ri tch t khi ngun, nhng t trong mt in mi lng th.


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9

A B

C CM

NC C

A. in tch ca t tng, hiu in th gia hai bn gim.B. in tch ca t tng, hiu in th gia hai bn tng.C. in tch ca t khng i, hiu in th gia hai bn khng i.D. in tch ca t khng i, hiu in th gia hai bn gim.

Cu 111.Mt t in phng c mc vo hai cc ca mt ngun in c hiu in th 50V. Ngt t in ra khi ngun ri ko cho khong cchgia hai bn t tng gp hai ln. Hiu in th ca t in khi l

A. 25V. B. 50V. C. 75V. D. 100V.Cu 112. Mt t in phng khng kh c hai bn hnh trn ng knh D = 12cm, cch nhau mt khongd = 2mm. in dung ca t c gi tr .

A. 0,5.10-9F B. 2.10-10F C. 5.10-11F D. 2.10-9FCu 1.Hai t in c in dung C1= 1F v C2= 3F mc ni tip. in dung ca b t in l.

A. 4F. B. 2F. C. 0,75F. D. 0,5F.Cu 113.Hai t in c in dung C1= 1F v C2= 3F mc song song. in dung ca b t in l.

A. 4F. B. 2F. C. 0,75F. D. 0,5F.Cu 114.Hai t in c in dung C1= 0,4F v C2= 0,6F ghp song song vi nhau. Mc b t in vo ngun in c hiu in th U < 60Vth mt trong hai t in c in tch bng 3.10-5C. Hiu in th U c gi tr l.

A. 75V. B. 25V. C. 50V. D. 45V.Cu 115.Hai t in c in dung C1 = 0,5F v C2= 1F ghp ni tip vi nhau. Mc b tin vo ngun in c hiu in th U th hiuin th gia hai bn t C1l U1= 4V. Hiu in th U hai u b t c gi tr l.

A. 12V. B. 8V. C. 6V. D. 5V.Cu 116.Hai t in c in dung C1 = 0,5F v C2= 1F ghp ni tip vi nhau. Mc b t in vo ngun in c hiu in th U th hiuin th gia hai bn t C2l U2= 4V. Hiu in th U hai u b t c gi tr l.

A. 12V. B. 8V. C. 6V. D. 5V.Cu 117.C 3 t in ging nhau cng c in dung C. Thc hin 4 cch mc sau .

I. Ba t mc ni tip. II. Ba t mc song song. III. Hai t mc ni tip ri mc song song vi t th ba. IV. Hai t mc songsong ri mc ni tip vi t th ba. cch mc no in dung tng ng ca b t c gi tr Ct> C .

A. Ch I. B. Ch II. C. C I v IV. D. C II v III.Cu 118.Cho b t in nh hnh v. C2= 2C1. UAB= 14V. Hiu in th UMBc gi tr

A. 3V. B. 4V. C. 8V. D. 5,25V.Cu 119.C 3 t in ging nhau, in dung mi t in l 6F, c mc vi nhau thnh b t in.

in dung ca b t in khng th lA. 2F. B.3F. C. 4F. D. 9F.Cu 120.Ba t in ging ht nhau, mi t c in dung C = 60F.Hai t mc ni tip ri mc songsong vi t th ba. in dung ca b t bng.

A. 20F. B. 40F. C. 90F. D. 180F.Cu 121.Ba t in ging ht nhau, mi t c in dung C = 60F. Hai t mc song song ri mc nitip vi t th ba. in dung ca b t bng.

A. 20F. B. 40F. C. 90F. D. 180F.Cu 123.Mt b t gm ba t c in dung C1, C2, C3ghp song song, trong C1= C2= C, C3= 2C. Khi c tch in bng ngun c hiu inth 45V th in tch ca b t in bng 18.10-4C. Gi tr in dung C

A. 10F. B. 16F. C. 20F. D. 100F.Cu 124.Cho b t nh hnh . C1= 1F, C2= 4F, C3= C4= 5F. Hiu in th gia hai im A v B l UAB= 100V. Hiu in th UMNgia hai

im M v N l .A. 70V B. - 30VC. + 30V D. -70V.

Cu 125.Mt t in c in dung C1= 1F c tch in n hiu in th U1= 200V v mtt in th hai c in dung C2= 3F c tch in n hiu in th U2= 400V. Hiu in thca b t in, khi ni hai bn tch in cng du vi nhau l

A. 250V. B. 300V. C. 350V. D. 400V.Cu 126.C 4 t C1= 3F, C2= 6F, C3= C4= 2F c mc nh hnh v.Hiu in th giahai im A v B l UAB= 12V.Hiu in th UAMgia hai im A v M l .

C2 C1

C1 C1

MNA

+

B -


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10

A.8V. B. 6V. C. 4V. D. 1,2V.Cu 127.Mt t in c in dung C1= 1F c tch in n hiu in th U1= 200V v mt t in th hai c in dung C2= 3F c tchin n hiu in th U2= 400V. Tnh hiu in th ca b t in, khi ni hai bn tch in tri du vi nhau.

A. 250V. B. 300V. C. 350V. D. 400V.Cu 128.Hai t C1= 2F, C2= 0,5F tch in n hiu in th U1= 100V, U2= 50V ri ngt khi ngun. Ni cc bn khc du ca hai t vinhau. Hiu in th ca b t in l

A. 90V. B. 75V. C. 70V. D. 25V.

Cu 129.Hai t C1= 2F, C2= 0,5F tch in n hiu in th U1 = 100V, U2= 50V ri ngt khi ngun. Ni cc bn cng du ca hai t vinhau. Hiu in th ca b t in lA. 150V. B. 90V. C. 75V. D. 70V.

Cu 130.T C1= 2F tch in n hiu in th 60V, sau ngt khi ngun v ni song song vi t C2cha tch in. Hiu in th ca b t sau l 40V. in dung C2v in tch mi t lc sau l

A. C2= 1F, q1 = 8.10-5C, q2 = 4.10

-5C. B. C2= 1F, q1 = q2 = 6.10-5C.

C. C2= 2F, q1 = q2 = 6.10-5C. D. C2= 1F, q1 = 4.10

-5C, q2 = 8.10-5C.

Cu 131. Cho hai t. t th nht C1 = 5F chu c hiu in th gii hn Ugh1 = 500V, t th haiC2= 10F chu c hiu in th gii hn Ugh2= 1000V. Ghp hai t in thnh b. Hiu in th gii hn ca b t khi hai t trn mc song songl

A. 500V. B. 1000V. C. 750V. D. 600V.Cu 132. Cho hai t. t th nht C1 = 5F chu c hiu in th gii hn Ugh1 = 500V, t th hai

C2= 10F chu c hiu in th gii hn Ugh2= 1000V. Ghp hai t in thnh b. Hiu in th gii hn ca b t khi hai t trn mc ni tip lA. 500V. B. 1000V. C. 750V. D. 600V.Cu 133.Mt loi giy cch in c th chu c cng in trng ti a l E = 1200V/mm. C hai t in phng c in dung ging nhau C= 300pF vi lp in mi bng loi giy ni trn c b dy d = 2mm. Hai t in c mc ni tip, hiu in th gii hn cab t trn l

A. 4800V. B. 1200V. C. 3600V. D. 2400V.Cu 134.Mt loi giy cch in c th chu c cng in trng ti a l E = 1200V/mm. C hai t in phng c in dung C1= 300pFv C2 = 600pF vi lp in mi bng loi giy ni trn c b dyd = 2mm. Hai t in c mc ni tip, hiu in th gii hn ca b t trn l

A. 4800V. B. 1200V. C. 3600V. D. 2400V.Cu 135.Nng lng ca t in c xc nh bng cng thc no sau y .

A. W =2

1CUB. W =

21 Q

2 C C. W =

2

1QU2 D. W =

2

1QC.

Cu 136.Mt t in c in dung C = 50nF, c tch in th gia hai bn t c hiu in th U = 10V. Nng lng in trng trong t bng.A. 2,5.10-6J. B. 5.10-6J. C. 2,5.10-4J. D. 5.10-4J.

Cu 137.Chn cusai. Sau khi ngt t in phngkhi ngun in, ta tnh tin hai bn t khong cch gia chng gim, khi .A. in tch trn hai bn t s khng i. B. in dung ca t tng.C. hiu in th gia hai bn t gim. D. nng lng in trng trong t tng.

Cu 138.Chn phngn ng. Sau khi ngt t in ra khi ngun in, ta tnh tin hai bn khong cch gia chng gim i hai ln, khi nnglng in trng trong t in.

A. tng ln hai ln. B. tng ln bn ln. C. gim i hai ln. D. gim i bn ln.Cu 5.Chn phng nng. Sau khi ngt t in ra khi ngun in, ta ko tnh tin hai bn khong cch gia chng tng ln hai ln, khi nng lng in trng trong t in.

A. tng ln hai ln. B. tng ln bn ln. C. gim i hai ln. D. gim i bn ln.Cu 139.Sau khi ngt mt t in phng ra khi ngun in, ta tng khong cch gia hai bn cc ca t in ln hai ln, khi mt nng lngin trng trong t in

A. khng i. B. tng ln hai ln. C. gim i 2 ln. D. tngln 4 ln.Cu 140.Hai t C1= 2F, C2= 0,5F tch in n hiu in th U1= 100V, U2= 50V ri ngt khi ngun. Ni cc bn khc du ca hai t vinhau. Nng lng ca tia la in pht ra lA. 4500 J. B. 0,5.10-3J. C. 4,5.10-3J. D. 500 J.Cu 141.Hai t C1= 2F, C2= 0,5F tch in n hiu in th U1 = 100V, U2= 50V ri ngt khi ngun. Ni cc bn cng du ca hai t vinhau. Nng lng ca tia la in pht ra l

A. 4500 J. B. 0,5.10-3J. C. 4,5.10-3J. D. 500 J.Cu 142.Mt b t in gm 10 t in ging nhau mi t c in dung C = 8F ghp ni tip vi nhau. B t in c ni vi hiu in thkhng i U = 150V. bin thin nng lng ca b t in sau khi c mt t in b nh thng l.


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A. W = 9 mJ. B. W = 10 mJ. C. W = -1 mJ. D.W = 1 mJ.Cu 143.Trong nhng cch sau cch no c th lm nhim in cho mt vt.

A. C chic v bt ln tc. B. t mt nhanh nha gn mt vt nhim in.C. t mt vt gn ngun in. D. Cho mt vt tip xc vi vin pin.

Cu 143.Trong cc hin tng sau, hin tng nokhnglin quan n nhim in.A. V ma ng lc dnh rt nhiu tc khi chi u.B. Chim thng x lng v ma rt.C. t ch nhin liu thng th mt si dy xch ko l trn mt ng.D. St gia cc m my.

Cu 145.in tch im lA. vt c kch thc rt nh. B. in tch coi nh tp trung ti mt im.C. vt cha rt t in tch. D. im pht ra in tch.

Cu 146.V s tng tc in, trong cc nhn nh di y, nhn nh sai lA. Cc in tch cng loi th y nhau.B. Cc in tch khc loi th ht nhau.C. Hai thanh nha ging nhau, sau khi c xt vi len d, nu a li gn th chng s ht nhau. D. Hai thanh thy tinh sau khi c xt vo la, nu a li gn nhau th chng s y nhau.

Cu 147.Khi khong cch gia hai in tch im trong chn khng gim xung 2 ln th ln lc Cu-lngA. tng 4 ln. B. tng 2 ln. C. gim 4 ln. D. gim 4 ln.

Cu 148.Nhn xt khng ng v in mi l.A. in mi l mi trng cch in.B. Hng s in mi ca chn khng bng 1.C. Hng s in mi ca mt mi trng cho bit lc tng tc gia cc in tch trong mi trng nh hn so vi khi chng t trong chn

khng bao nhiu ln.D. Hng s in mi c th nh hn 1.

Cu 149.C th p dng nh lut Cu-lng tnh lc tng tc trong trng hpA. tng tc gia hai thanh thy tinh nhim t gn nhau.B. tng tc gia mt thanh thy tinh v mt thanh nha nhim in t gn nhau. C. tng tc gia hai qu cu nh tch in t xa nhau.D. tng tc in gia mt thanh thy tinh v mt qu cu ln.

Cu 145.C th p dng nh lut Cu-lng cho tng tc no sau y.A. Hai in tch im dao ng quanh hai v tr c nh trong mt mi trng.

B. Hai in tch im nm ti hai v tr c nh trong mt mi trng.C. Hai in tch im nm c nh gn nhau, mt trong du, mt trong nc.D. Hai in tch im chuyn ng t do trong cng mi trng.

Cu 146.Cho 2 in tch c ln khng i, t cch nhau mt khong khng i. Lc tng tc gia chng s ln nht khi t trongA. chn khng. B. nc nguyn cht.C. du ha. D. khng kh iu kin tiu chun.

Cu 147.Xt tng tc ca hai in tch im trong mt mi trng xc nh. Khi lc y Cu-lng tng 2 ln th hng s in miA. tng 2 ln. B. vn khng i. C. gim 2 ln. D. gim 4 ln.

Cu 148.S khng c ngha khi ta ni v hng s in mi caA. hc n ( nha ng). B. nha trong. C. thy tinh. D. nhm.

Cu 149.Trong vt no sau y khng c in tch t do.A. thanh niken. B. khi thy ngn. C. thanh ch. D. thanh g kh.

Cu 150.Hai in tch im tri du c cng ln 10-4/3 C t cch nhau 1m trong parafin c in mi bng 2 th chngA. ht nhau mt lc 0,5 N. B. ht nhau mt lc 5 N.C. y nhau mt lc 5N. D. y nhau mt lc 0,5 N.

Cu 151.Hai in tch im cng ln 10-4C t trong chn khng, tng tc nhau bng lc c ln 10 -3N th chng phi t cch nhauA. 30000 m. B. 300 m. C. 90000 m. D. 900 m.

Cu 152.Hai in tch im c t c nh v cch in trong mt bnh khng kh th ht nhau 1 lc l 21N. Nu y du ha c hng s inmi 2,1 vo bnh th hai in tch s

A. ht nhau 1 lc bng 10 N. B. y nhau mt lc bng 10 N.C. ht nhau mt lc bng 44,1 N. D. y nhau 1 lc bng 44,1 N.


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Cu 153.Hai in tch im c t c nh v cch in trong mt bnh khng kh th lc tng tc tnh i 12 N. Khi y mt cht lng cchin vo bnh th lc tng tc gia chng l 4 N. Hng s in mi ca cht lng ny l

A. 3. B. 1/3. C. 9. D. 1/9Cu 154.Hai in tch im t cch nhau 100 cm trong parafin c hng s in mi bng 2 th tng tc vi nhau bng lc 8 N. Nu chng ct cch nhau 50 cm trong chn khng th tng tc nhau bng lc c ln l

A. 1 N. B. 2 N. C. 8 N. D. 48 N.Cu 155.Hai in tch im cng ln c t cch nhau 1 m trong nc nguyn cht tng tc vi nhau mt lc bng 10 N. Nc nguyn chtc hng s in mi bng 81. ln ca mi in tch l

A. 9 C. B. 9.10-8C. C. 0,3 mC. D. 10-3C.Cu 156.Xt cu to nguyn t v phng din in. Trong cc nhn nh sau, nhn nh khng ng l.

A. Proton mang in tch l + 1,6.10-19C.B. Khi lng notron xp x khi lng proton.C. Tng s ht proton v notron trong ht nhn lun bng s electron quay xung quanh nguyn t.D. in tch ca proton v in tch ca electron gi l in tch nguyn t.

Cu 157.Ht nhn ca mt nguyn t oxi c 8 proton v 9 notron, s electron ca nguyn t oxi lA. 9. B. 16. C. 17. D. 8.

Cu 158.Tng s proton v electron ca mt nguyn t c th l s no sau y.A. 11. B. 13. C. 15. D. 16.

Cu 159.Nu nguyn t ang tha 1,6.10-19C in lng m n nhn c thm 2 electron th nA. s l ion dng. B. vn l 1 ion m.

C. trung ho v in. D. c in tch khng xc nh c.Cu 160.Nu nguyn t oxi b mt ht electron n mang in tch

A. + 1,6.10-19C. B.1,6.10-19C. C. + 12,8.10-19C. D. - 12,8.10-19C.Cu 161.iu kin 1 vt dn in l

A. vt phi nhit phng. B. c cha cc in tch t do.C. vt nht thit phi lm bng kim loi. D. vt phi mang in tch.

Cu 161.Vt b nhim in do c xt v khi c xtA. eletron chuyn t vt ny sang vt khc. B. vt b nng ln.C. cc in tch t do c to ra trong vt. D. cc in tch b mt i.

Cu 162.Trong cc hin tng sau, hin tng nhim in do hng ng l hin tngA. u thanh kim loi b nhim in khi t gn 1 qu cu mang in.B. Thanh thc nha sau khi mi ln tc ht c cc vn giy.

C. Ma hanh kh, khi mc qun vi tng hp thng thy vi bdnh vo ngi.D. Qu cu kim loi b nhim in do n chm vo thanh nha va c xt vo len d.

Cu 163.Cho 3 qu cu kim loi tch in ln lt tch in l + 3 C, - 7 C v4 C. Khi cho chng c tip xc vi nhau th in tch ca h l A.8 C. B.11 C. C. + 14 C. D. + 3 C.

Cu 165.in trng lA. mi trng khng kh quanh in tch.B. mi trng cha cc in tch.C. mi trng bao quanh in tch ng yn, gn vi in tch v tc dng lc in ln cc in tch khc t trong n.D. mi trng dn in.

Cu 166.Cng in trng ti mt im c trng choA. th tch vng c in trng l ln hay nh.B. in trng ti im v phng din d tr nng lng.

C. tc dng lc ca in trng ln in tch ti im .D.tc dch chuyn in tch ti im .

Cu 167.Ti mt im xc nh trong in trng tnh, nu ln ca in tch th tng 2 ln th ln cng in trngA. tng 2 ln. B. gim 2 ln. C. khng i. D. gim 4 ln.

Cu 168.Vc t cng in trng ti mi im c chiuA. cng chiu vi lc in tc dng ln in tch th dng ti im . B. cng chiu vi lc in tc dng ln in tch th ti im .C. ph thuc ln in tch th.D. ph thuc nhit ca mi trng.

Cu 169.Trong cc n v sau, n v ca cng in trng l.


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A. V/m2. B. V.m. C. V/m. D. V.m2.Cu 170.Cho mt in tch im Q. in trng ti mt im m n gy ra c chiu

A. hng v pha n. B. hng ra xa n.C. ph thuc ln ca n. D. ph thuc vo in mi xung quanh.

Cu 171. ln cng in trng ti mt im gy bi mt in tch im khng ph thucA. ln in tch th. C. khong cch t im ang xt n in tch .B. ln in tch . D. hng s in mi ca ca mi trng.

Cu 172.Nu ti mt im c 2 in trng thnh phn gy bi 2 in tch im. Hai cng in trng thnh phn cng phng khi imang xt nm trn

A. ng ni hai in tch.B. ng trung trc ca on ni hai in tch.C. ng vung gc vi on ni hai in tch ti v tr in tch 1.D. ng vung gc vi on ni hai in tch ti v tr in tch 2.

Cu 173.Nu ti mt im c 2 in trng gy bi 2 in tch im Q1m v Q2dng th hng ca cng in trng ti im c xcnh bng

A. hng ca tng 2 vc t cng in trng in trng thnh phn.B. hng ca vc t cng in trng gy bi in tch dng.C. hng ca vc t cng in trng gy bi in tch m.D. hng ca vc t cng in trng gy bi in tch gn im ang xt hn.

Cu 174.Cho 2 in tch im nm 2 im A v B v c cng ln, cng du. Cng in trng ti mt im trn ng trung trc caAB th c phng

A. vung gc vi ng trung trc ca AB. B. trng vi ng trung trc ca AB.C. trng vi ng ni ca AB. D. to vi ng ni AB gc 450.

Cu 175.Cho 2 in tch im nm 2 im A v B v c cng ln, cng du. im c in trng tng hp bng 0 lA. trung im ca AB.B. ttc cc im trn trn ng trung trc ca AB.C. cc im to vi im A v im B thnh mt tam gic u.D. cc im to vi im A v im B thnh mt tam gic vung cn.

Cu 176.Nu khong cch t in tch ngun ti im ang xt tng 2 ln th cng in trngA. gim 2 ln. B. tng 2 ln. C. gim 4 ln. B. tng 4 ln.

Cu 177.Cho hai qu cu kim loi tch in c ln bng nhau nhng tri du t cch nhau mt khong khng i ti A v B th ln cng in trng ti mt im C trn ng trung trc ca AB v to vi A v B thnh tam gic u l E. Sau khi cho hai qu cu tip xc vi nhau ri

t li A v B th cng in trng ti C lA. 0. B. E/3. C. E/2. D. E.

Cu 178.ng sc in cho bitA. ln lc tc dng ln in tch t trn ng sc y.B. ln ca in tch ngun sinh ra in trng c biu din bng ng sc y.C. ln in tch th cn t trn ng sc y.D. hng ca lc in tc dng ln in tch im c trn ng sc y.

Cu 179.Trong cc nhn xt sau, nhn xt khng ng vi c im ng sc in l.A. Cc ng sc ca cng mt in trng c th ct nhau.B. Cc ng sc ca in trng tnh l ng khng khp kn.C. Hng ca ng sc in ti mi im l hng ca vc tcng in trng ti im .D. Cc ng sc l cc ng c hng.

Cu 180.Nhn nh no sau y khng ng v ng sc ca in trng gy bi in tch im + Q.A. l nhng tia thng. B. c phng i qua in tch im.C. c chiu hng v pha in tch. D. khng ct nhau.

Cu 181.in trng u l in trng m cng in trng ca nA. c hng nh nhau ti mi im. B. c hng v ln nh nhau ti mi in.C. c ln nh nhau ti mi im. D. c ln gim dn theo thi gian.

Cu 182.t mt in tch th - 1C ti mt im, n chu mt lc in 1mN c hng t tri sang phi. Cng in trng c ln vhng l

A. 1000 V/m, t tri sang phi. B. 1000 V/m, t phi sang tri.C. 1V/m, t tri sang phi. D.1 V/m, t phi sang tri.


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Cu 183.. Mt in tch-1C t trong chn khng sinh ra in trng ti mt im cch n 1m c ln v hng lA. 9000 V/m, hng v pha n. B. 9000 V/m, hng ra xa n.C. 9.109V/m, hng v pha n. D. 9.109V/m, hng ra xa n.

Cu 184.Mt im cch mt in tch mt khong c nh trong khng kh c cng in trng 4000 V/m theo chiu t tri sang phi. Khi mt cht in mi c hng s in mi bng 2 bao chm in tchim v im ang xt th cng in trng ti im c ln v hng l

A. 8000 V/m, hng t tri sang phi. B. 8000 V/m, hng t phi sang tri.C. 2000 V/m, hng t phi sang tri. D. 2000 V/m hng t tri sang phi.

Cu 185.Trong khng kh, ngi ta b tr 2 in tchc cng ln 0,5C nhng tri du cch nhau 2 m. Ti trung im ca 2 in tch, cng in trng l

A. 9000 V/m hng v pha in tch dng.B. 9000 V/m hng v pha in tch m.C. bng 0.D. 9000 V/m hng vung gc vi ng ni hai in tch.

Cu 186.Cho 2 in tch im tri du, cng ln nm c nh thA. khng c v tr no c cng in trng bng 0.B. v tr c in trng bng 0 nm ti trung im ca on ni 2 in tch.C. v tr c in trng bng 0 nm trn ng ni 2in tch v pha ngoi in tch dng.D. v tr c in trng bng 0 nm trn ng ni 2 in tch v pha ngoi in tch m.

Cu 187.Ti mt im c 2 cng in trng thnh phn vung gc vi nhau v c ln l 3000 V/m v 4000V/m. ln cng intrng tng hp l

A. 1000 V/m. B. 7000 V/m. C. 5000 V/m. D. 6000 V/m.Cu 188.Cng ca lc in khng ph thuc vo

A. v tr im u v im cui ng i. B. cng ca in trng.C. hnh dng ca ng i. D. ln in tch b dch chuyn.

Cu 189.Th nng ca in tch trong in trng c trng choA. kh nng tc dng lc ca in trng. B. phng chiu ca cng in trng.C. kh nng sinh cng ca in trng. D. ln nh ca vng khng gian c in trng.

Cu 190.Nu chiu di ng i ca in tch trong in trng tng 2 ln th cng ca lc in trngA. cha d kin xc nh. B. tng 2 ln.C. gim 2 ln. D. khng thay i.

Cu 191.Cng ca lc in trng khc 0 trong khi in tchA. dch chuyn gia 2 im khc nhau ct cc ng sc.B. dch chuyn vung gc vi cc ng sc trong in trng u.C. dch chuyn ht qu o l ng cong kn trong in trng.D. dch chuyn ht mt qu o trn trong in trng.

Cu 193.Khi in tch dich chuyn dc theo mt ng sc trong mt in trng u, nu qung ng dch chuyn tng 2 ln th cng ca lcin trng

A. tng 4 ln. B. tng 2 ln. C. khng i. D. gim 2 ln.Cu 192.Nu in tch dch chuyn trong in trng sao cho th nng ca n tng th cng ca ca lc in trng

A. m. B. dng.C. bng khng. D. cha d kin xc nh.Cu 193.Cng ca lc in trng dch chuyn mt in tch 1C dc theo chiu mt ng sc trong mt in trng u 1000 V/m trn qungng di 1 m l

A. 1000 J. B. 1 J. C. 1 mJ. D. 1J.Cu 194.Cng ca lc in trng dch chuyn mt in tch-2C ngc chiu mt ng sc trong mt in trng u 1000 V/m trn qungng di 1 m l

A. 2000 J. B.2000 J. C. 2 mJ. D.2 mJ.Cu 195.Cho in tch dch chuyn gia 2 im c nh trong mt in trng u vi cng 150 V/m th cng ca lc in trng l 60 mJ.

Nu cng in trng l 200 V/m th cng ca lc in trng dch chuyn in tch gia hai im lA. 80 J. B. 40 J. C. 40 mJ. D. 80 mJ.

Cu 196.Cho in tch q = + 10-8C dch chuyn gia 2 im c nh trong mt in trng u th cng ca lc in trng l 60 mJ. Nu mtin in tch q = + 4.10-9C dch chuyn gia hai im th cng ca lc in trng khi l

A. 24 mJ. B. 20 mJ. C. 240 mJ. D. 120 mJ.


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Cu 197.Cng ca lc in trng dch chuyn qung ng 1 m mt in tch 10 C vung gc vi cc ng sc in trong mt in trngu cng 106V/m l

A. 1 J. B. 1000 J. C. 1 mJ. D. 0 J.Cu 198.Cng ca lc in trng dch chuyn mt in tch 10 mC song song vi cc ng sc trong mt in trng u vi qung ng 10cm l 1 J. ln cng in trng l

A. 10000 V/m. B. 1 V/m. C. 100 V/m. D. 1000 V/m.Cu 199.Khi in tch dch chuyn trong in trng u theo chiu ng sc th n nhn c mt cng 10J. Khi dch chuyn to vi chiung sc 600trn cng di qung ng th n nhn c mt cng l

A. 5 J. B. 2/35 J. C. 25 J. D. 7,5J.Cu 200.in th l i lng c trng cho ring in trng v

A. kh nng sinh cng ca vng khng gian c in trng.B. kh nng sinh cng ti mt im.C. kh nng tc dng lc ti mt im.D.kh nng tc dng lc ti tt c cc im trong khng gian c in trng.

Cu 202.Khi ln in tch th t ti mt im tng ln gp i th in th ti im A. khng i. B. tng gp i. C. gim mt na. D. tng gp 4.

Cu 203.n v ca in th l vn (V). 1V bngA. 1 J.C. B. 1 J/C. C. 1 N/C. D. 1. J/N.

Cu 204.Trong cc nhn nh di y v hiu in th, nhn nhkhng ngl.

A. Hiu in th c trng cho kh nng sinh cng khi dch chuyn in tch gia hai im trong in trng.B. n v ca hiu in th l V/C.C. Hiu in th gia hai im khng ph thuc in tch dch chuyn gia hai im . D. Hiu in th gia hai im ph thuc v tr ca hai im .

Cu 205.Quan h gia cng in trng E v hiu inth U gia hai im m hnh chiu ng ni hai im ln ng sc l d th chobi biu thc

A. U = E.d. B. U = E/d. C. U = q.E.d. D. U = q.E/q.Cu 206.Trong mt in trng u, nu trn mt ng sc, gia hai im cch nhau 4cm c hiu inth 10V, gia hai im cch nhau 6 cmc hiu in th l

A. 8V. B. 10V. C. 15V. D. 22,5V.Cu 207.Hai im trn mt ng sc trong mt in trng u cch nhau 2m. ln cng in trng l 1000V/m2. Hiu in th giahai im l

A. 500V. B. 1000V. C. 2000V. D. 1500V.Cu 208.Gia hai bn kim loi phng song song cch nhau 4 cm c mt hiu in th khng i 200 V. Cng in trng khong gia haibn kim loi l

A. 5000V/m. B. 50V/m. C. 800V/m. D. 80V/m.Cu 209.Trong mt in trng u, im A cch im B 1m, cch im C 2m. Nu UAB= 10V th UAC

A. = 20V. B. = 40V. C. = 5V. D. 2V.Cu 210.Cng ca lc in trng dch chuyn mt in tch - 2C t A n B l 4mJ. UABc gi tr

A. 2V. B. 2000V. C.8V. D.2000V.Cu 211.T in l

A. h thng gm hai vt t gn nhau v ngn cch nhau bng mt lp cch in. B. h thng gm hai vt dn t gn nhau v ngn cch nhau bng mt lp cch in. C. h thng gm hai vt dn t tip xc vi nhau v c bao bc bng in mi.

D. h thng hai vt dn t cch nhau mt khong xa.Cu 212.Trong trng hp no sau y ta c mt t in.A. hai tm g kh t cch nhau mt khong trong khng kh.B. hai tm nhm t cch nhau mt khong trong nc nguyn cht.C. hai tm km ngm trong dung dch axit.D. hai tm nha ph ngoi mt l nhm.

Cu 213. tch in cho t in, ta phiA. mc vo hai u t mt hiu in th. B. c xt cc bn t vi nhau.C. t t gn vt nhim in. D. t t gn ngun in.

Cu 214.Trong cc nhn xt v t in di y, nhn xt khng ng lA. in dung c trng cho kh nng tch in ca t.


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B. in dung ca t cng ln th tch c in lng cng ln.C. in dung ca t c n v l Fara F.D. Hiu in th cng lnth in dung ca t cng ln.

Cu 215.Fara l in dung ca mt t in mA. gia hai bn t c hiu in th 1V th n tch c in tch 1C. B. gia hai bn t c mt hiu in th khng i th n c tch in 1C. C. gia hai bn t c in mi vi hng s in mi bng 1.D. khong cch gia hai bn t l 1mm.

Cu 216.1nF bngA. 10-9F. B. 10-12F. C. 10-6F. D. 10-3F.

Cu 217.Nu hiu in th gia hai bn t tng 2 ln th in dung ca tA. tng 2 ln. B. gim 2 ln. C. tng 4 ln. D. khng i.

Cu 218.Gi tr in dung ca t xoay thay i l doA. thay i in mi trong lng t. B. thay i phn din tch i nhau gia cc bn t.C. thay i khong cch gia cc bn t. D. thay i cht liu lm cc bn t.

Cu 219.Trong cc cng thc sau, cng thc khng phi tnh nng lng in trng trong t in l.A. W = Q2 /2C. B. W = QU/2. C. W = CU2/2. D. W = C2/2Q.

Cu 220.Vi mt t in xc nh, nu hiu in th hai u t gim 2 ln th nng lng in trngca tA. tng 2 ln. B. tng 4 ln. C. khng i. D. gim 4 ln.

Cu 221.Vi mt t in xc nh, nu mun nng lng in trng ca t tng 4 ln th phi tng in tch ca t

A. tng 16 ln. B. tng 4 ln. C. tng 2 ln. D. khng i.Cu 222.Trng hp no sau y ta khng c mt t in.

A. Gia hai bn kim loi s. B. Gia hai bn kim loi khng kh.C. Gia hai bn kim loi l nc vi. D. Gia hai bn kim loi nc tinh khit.

Cu 223.Mt t c in dung 2 F. Khi t mt hiu in th 4 V vo 2 bn ca t in th t tch c mt in lng lA. 2.10-6C. B. 16.10-6C. C. 4.10-6C. D. 8.10-6C.

Cu 224.t vo hai u t mt hiu in th 10 V th t tch c mt in lng 20.10-9C. in dung ca t lA. 2 F. B. 2 mF. C. 2 F. D. 2 nF.

Cu 225.Nu t vo hai u t mt hiu in th 4 V th t tch c mt in lng 2 C. Nu t vo hai u t mt hiu in th 10 V th t tchc mt in lng

A. 50C. B. 1C. C. 5C. D. 0,8C.Cu 226. t tch mtin lng 10 nC th t vo hai u t mt hiu in th 2V. t tch c in lng 2,5 nC th phi t vo hai u

t mt hiu in thA. 500 mV. B. 0,05 V. C. 5V. D. 20 V.

Cu 227.Hai u t 20 F c hiu in th 5V th nng lng t tch c lA. 0,25 mJ. B. 500 J. C. 50 mJ. D. 50J.

Cu 228.Mt t in c tch in bng mt hiu in th 10 V th nng lng ca t l 10 mJ. Nu mun nng lng ca t l 22,5 mJ th haibn t phi c hiu in th l

A. 15 V. B. 7,5 V. C. 20 V. D. 40 V.Cu 229.Gia hai bn t phng cch nhau 1 cm c mt hiu in th 10 V. Cng in trng u trong lng t l

A. 100 V/m. B. 1 kV/m. C. 10 V/m. D. 0,01 V/m.Cu 230.. in tch im l

A. vt c kch thc rt nh. B. in tch coi nh tp trung ti mt im.C. vt cha rt t in tch. D. im pht ra in tch.

Cu 231.. V s tng tc in, trong cc nhn nh di y, nhn nhsailA. Cc in tch cng loi th y nhau.B. Cc in tch khc loi thht nhau.C. Hai thanh nha ging nhau, sau khi c xt vi len d, nu a li gn th chng s ht nhau. D. Hai thanh thy tinh sau khi c xt vo la, nu a li gn nhau th chng s y nhau.

Cu 232.Khi khong cch gia hai in tch im trong chn khng gim xung 2 ln th ln lc Cu lngA. tng 4 ln. B. tng 2 ln. C. gim 4 ln. D. gim 4 ln.

Cu 235.Nhn xt khngngv in mi l.A. in mi l mi trng cch in.B. Hng s in mi ca chn khng bng 1.


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C. Hng s in mi ca mt mi trng cho bit lc tng tc gia cc in tch trong mi trng nh hn so vi khi chng t trong chnkhng bao nhiu ln.D. Hng s in mi c th nh hn 1.

Cu 233.C th p dng nh lut Cu-lng tnh lctng tc trong trng hpA. tng tc gia hai thanh thy tinh nhim t gn nhau.B. tng tc gia mt thanh thy tinh v mt thanh nha nhim in t gn nhau.C. tng tc gia hai qu cu nh tch in t xa nhau.D. tng tc in gia mt thanh thy tinh v mt qu cu ln.

Cu 234.C th p dng nh lut Cu-lng cho tng tc no sau y.A. Hai in tch im dao ng quanh hai v tr c nh trong mt mi trng.B. Hai in tch im nm ti hai v tr c nh trong mtmi trng.C. Hai in tch im nm c nh gn nhau, mt trong du, mt trong nc. D. Hai in tch im chuyn ng t do trong cng mi trng.

Cu 235.Cho 2 in tch c ln khng i, t cch nhau mt khong khng i. Lc tng tc gia chng s ln nht khi t trongA. chn khng. B. nc nguyn cht. C. du ha. D. khng kh iu kin tiu chun.

Cu 236.Xt tng tc ca hai in tch im trong mt mi trng xc nh. Khi lc y Cu-lng tng 2 ln th hng s in miA. tng 2 ln. B. vn khng i. C. gim 2 ln. D. gim 4 ln.

Cu 237.S khng c ngha khi ta ni v hng s in mi caA. hc n . B. nha thnng. C. thy tinh. D. nhm.

Cu 238.Trong vt no sau y khng c in tch t do.A. thanh niken. B. khi thy ngn. C. thanh ch. D. thanh g kh.

Cu 239.Hai in tch im tri du c cng ln 10-4/3 C t cch nhau 1 m trong parafin c in mi bng 2 th chngA. ht nhau mt lc 0,5 N. B. ht nhau mt lc 5 N.C.y nhau mt lc 5N. D. y nhau mt lc 0,5 N.

Cu 240.Hai in tch im cng ln 10-4C t trong chn khng, tng tc nhau bng lc c ln 10 -3N th chng phi t cch nhauA. 30000 m. B. 300 m. C. 90000 m. D. 900 m.

Cu 241.Hai in tch im c t c nh v cch in trong mt bnh khng kh th ht nhau 1 lc l 21N. Nu y du ha c hng s inmi 2,1 vo bnh th hai in tch s

A. ht nhau 1 lc bng 10 N. B. y nhau mt lc bng 10 N.C. ht nhau mt lc bng 44,1 N. D. y nhau 1 lc bng 44,1 N.

Cu 242.Hai in tch im c t c nh v cch in trong mt bnh khng kh th lc tng tc tnh in gia chng l 12N. Khi y mtcht lng cch in vo bnh th lc tng tc gia chng l 4N. Hng s in mi ca cht lng ny l

A. 3. B. 1/3. C. 9. D. 1/9Cu 243.Hai in tch im t cch nhau 100cm trong parafin c hng s in mi bng 2 th tng tc vi nhau bng lc 8N. Nu chngct cch nhau 50cm trong chn khng th tng tc nhau bng lc c ln l

A. 1 N. B. 2 N. C. 8 N. D. 48 N.Cu 244.Hai in tch im cng ln c t cch nhau 1m trong nc nguyn cht tng tc vi nhau mt lc bng 10N. Nc nguyn chtc hng s in mi bng 81. ln ca mi in tch lA. 9 C. B. 9.10-8C. C. 0,3 mC. D. 10-3C.

Cu 245.Chn cung. Khi tng ng thi ln ca hai in tch im v khong cch gia chng ln gp i th lc tng tc gia chng A.tng ln gp i B. gim i mt na C.gim i bn ln D. khng thay i

Cu 246.Trong trng hp no sau y ta c th coi cc vt nhim in l cc in tch im. A.Hai thanh nha t gn nhau. B.Mt thanh nha v mt qu cut gn nhauC.Hai qu cu nh t xa nhau. D.Hai qu cu ln t gn nhau.

Cu 247.Hy chn pht biu ng. ln ca lc tng tc gia hai in tch im trong khng kh.A.t l thun vi bnh phng khong cch gia hai in tch.B.t l thun vi khong cch gia hai in tch.C. t l nghch vi bnh phng khong cch gia hai in tch.D. t l nghch vi khong cch gia hai in tch.

Cu 248.Nhim in cho mt thanh nha ri a n li gn hai vt M v N. Ta thy thanh nha ht c hai vt M v N .Tnh hung no di ychc chn khng th xy ra.

A.M v N nhim in cng du. B. M v N nhim in tri du.C. M nhim in, cn N khng nhim in. D.C M v N u khng nhim in.

Cu 249.Mt h c lp gm ba in tch im, c khi lng khng ng k, nm cn bng vi nhau. Tnh hung no di y c th xy ra.


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A.Ba in tch cng du nm ba nh ca mt tam gic u.B. Ba in tch cng du nm trn mt ng thng.C. Ba in tch khng cng du nm ba nh ca mt tam gic u.D. Ba in tch khng cng du nm trn mt ng thng.

Cu 250.Nu tng khong cch gia hai in tch im ln 3 ln th lc tng tc tnh in gia chng sA.tng ln 3 ln. B. gim i 3 ln . C. tng ln 9 ln. D. gim i 9 ln

Cu 251.Chn pht biu ng.. Cho h ba in tch c lp q1,q2,q3nm trn cng mt ng thng. Hai in tch q1,q3l hai in tch dng, cchnhau 60cm v q1= 4q3.Lc in tc dng ln q2bng 0. Nu vy, in tch q2

A.cch q120cm , cch q380cm. B. cch q120cm , cch q340cm.C. cch q140cm , cch q320cm. D. cch q180cm , cch q320cm.

Cu 252.Ti nh A ca mt tam gic cn c in tch q1>0. Hai in tch q2 v q3nm hai nh cn li. Lc tc dng ln q1song song vi yBC ca tam gic. Tnh hung no sau y khngth xy ra.

A.2 3q q . B. q2>0, q3 0. B.UAB< 0 C. UAB= 0. D.UABc th dng hoc mCu 259.Chn pht biung. Nu dch chuyn hai bn ca t in ni vi hai cc mt c quy ra xa nhau th trong khi dch chuyn

A. khng c dng in qua acquy.B.c dng in i t cc m qua acquy sang cc dng.C. c dng in i t cc dng qua acquy sang cc m.D.lc u c dng in i t cc m qua acquy sang cc dng, sau dng in c chiu ngc li.

Cu 260.Chn p sng. C bn t in nh nhau, in dung mi t in bng C .Mc ni tip bn t in thnh b th in dung ca b tin bngA. 4C. B. C/4. C. 2C. D. C/2.

Cu 261.Mi trng no di y khng cha in tch t do.A.Nc bin. B.Nc sng. C.Nc ma. D.Nc ct.

Cu 262.Trong trng hp no di y s khng xy ra hin tng nhim in do hng ng. t mt qu cu mang in gn u ca mtA.thanh kim loi khng mang in. B. thanh kim loi mang in dng.C. thanh kim loi mang in m. D.thanh nha mang in m.

Cu 263.Vo ma hanh kh, nhiu khi ko o len qua u, ta thy c ting n lch tch . l do A.hin tng nhim in do tip xc. B. hin tng nhim in do c xt.C. hin tng nhim in hng ng. B.c ba hin tng nu trn.


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Cu 264.a mt qu cu kim loi A nhim in dng li gn mt qu cu kim loi B nhim in dng. Hin tng no di y s xy ra . A.C hai qu cu u b nhim in do hng ng.B.C hai qu cu u khng b nhim in do hng ng.C.Ch c qu cu B b nhim in do hng ng.D. Ch c qu cu A b nhim in do hngng.

Cu 265..Mui n (NaCl ) kt tinh thnh in mi. Chn cu ng.A.Trong mui n kt tinh c ion dng t do. B. Trong mui n kt tinh c ion m t do.C. Trong mui n kt tinh c lectron t do. D. Trong mui n kt tinh khng c ion v lectron t do.

Cu 266.Ti im no di y s khng c in trng.A. bn ngoi, gn mt qu cu nha nhim in. B. bn trong, mt qu cu nha nhim in.C. bn ngoi, gn mt qu cu kim loi nhim in. D. bn trong, mt qu cu nha nhim in.

Cu 267.in trng trong kh quyn gn mt t c cng 200V/m , hng thng ng t trn xung di .Mt lectron (e = -1.6.10-19C) trong in trng ny s chu tc dng mt lc in c cng v hng nh th no.

A.3,2.10-21 N; hng thng ng t trn xung. B. 3,2.10-21N; hng thng ng t di ln.C. 3,2.10-17N; hng thng ng t trn xung. D. 3,2.10-17N; hng thng ng t di ln.

Cu 268.Cng ca lc in tc dng ln mtin tch im q khi di chuyn t im M n im N trong in trngA.t l thun vi chiu di ng i MN. B.t l thun vi ln ca in tch q.C.t l thun vi thi gian di chuyn. D.c ba A,B,C u khng ng.

Cu 260.Cng ca lc in tc dng ln mt in tch im q khi di chuyn t im M n im N trong mt in trng, th khng ph thuc voA. v tr ca cc im M,N. B.hnh dng ca ng i MN.

C.ln ca in tch q. D. ln ca cng in trng ti cc im trn ng i.Cu 270.Mt lectron bay t bn dng sang bn m trong in trng u ca mt t in phng, theo mt ng thng MN di 2 cm, c

phng lm vi ng sc in mt gc 600. Bit cng in trng trong t in l 1000V/m. Cng ca lc in trong dch chuyn ny l baonhiu.

A. +2,77.10-18J. B. -2,77.10-18J. C. +1,6.10-18J. D. -1,6.10-18J.Cu 271.t mt in tch im Q dng ti mt im O .M v N l hai im nm i xng vi nhau hai bn im O .Di chuyn mt in tchim q dng t M n N theo ng cong bt k. Gi AMNl cng ca lc in trong dch chuyn ny. Chn cu khng nh ng.

A. AMN 0 v ph thuc vo ng dch chuyn.B. AMN 0 khng ph thuc vo ng dch chuyn.C. AMN= 0 khng ph thuc vo ng dch chuyn.D. Khng th xc nh c AMN .

Cu 272.Khi mt in tch q di chuyn trong mt in trng t mt im A n mt im B th lc in sinh cng 2,5J. Nu th nng ca q ti A

l 2,5J, th th nng ca n ti B l bao nhiu .A.2,5J. B.5J. C. +5J. D. 0J.

Cu 273.Th nng ca mt lectron ti im M trong in trng ca mt in tch im l -3,2.10-19J . in tch ca lectron l e = 1,6.10-19C.in th ti im M bng bao nhiu.

A. +32V. B. -32V. C. +20V. D. -20V.Cu 274.Mt lectron (e = -1,6.10-19C) bay t im M n im N trong mt in trng, gia hai im c hiu in th UMN=100V. Cng mlc in sinh ra s l.

A. +1,6.10-19J. B. -1,6.10-19J. C. +1,6.10-17J. D. -1,6.10-17J.Cu 275.Th mt ion dng cho chuyn ng khng vn tc u t mt im bt k trong mt in trng do hai in tch imdng gy ra. Ion s chuyn ng

A.dc theo mt ng sc in. B.dc theo mt ng ni hai in tch im.C.t im c in th cao n im c in th thp. D.t im c in th thp n im c in th cao.

Cu 276.Hiu in th gia hai im M,N l UMN= 40V. Chn cu chc chn ng.A. in th M l 40V. B. in th N bng o.C. in th M c gi tr dng, N c gi tr m. D. in th M cao hn in th N 40V.

Cu 277.Chn cu pht biung.A.in dung ca t in ph thuc in tch ca n.B. in dung ca t in ph thuc hiu in th gia hai bn ca n.C. in dung ca t in ph thuc c vo in tch ln hiu in th gia hai bn ca t. D. in dung ca t in khng ph thuc in tch v hiu in th gia hai bn ca t.

Cu 278.Chn cu pht biung.A. in dung ca t in t l vi in tch ca n.


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B. in tch ca t in t l vi hiu in th gia hai bn ca n. C.Hiu in th gia hai bn t in t l vi in dung ca n.D. in dung ca t in t l nghch vi hiu in th gia hai bn ca n.

Cu 279.Hai t in cha cng mt loi in tch thA.chng phi c cng in dung.B.hiu in th gia hai bn ca mi t in phi bng nhau.C.t in no c in dung ln, s c hiu in th gia hai bn ln.D.t in no c in dung ln, s c hiu in th gia hai bn nh.

Cu 280.Trng hp no di y ta c mt t in.A.Mt qu cu kim loi nhim in, t xa cc vt khc.B. Mt qu cu thy tinh nhim in, t xa cc vt khc.C. Hai qu cu kim loi, khng nhim in, t gn nhau trong khng kh.D. Hai qu cu thy tinh, khng nhim in, t gn nhau trong khng kh.

Cu 281.Mt t in c in dung 20 F , c tch in di hiu in th 40V. in tch ca t in s l bao nhiu. A. 8.102C. B. 8C. C. 8.10-2C. D. 8.10-4C.

Cu 282.Trong cng thc tnh cng ca lc in tc dng ln mt in tch di chuyn trong in trng u A= qEd th d l g. Ch ra cu khngnh khng chc chn ng.

A. d l chiu di ca ng i.B.d l chiu di hnh chiu ca ng i trn mt ng sc.C.d l khong cch gia hnh chiu ca im u v im cui ca ng i trn mt ng sc. D.d l chiu di ng i nu in tch dch chuyn dc theo mt ng sc.

Cu 283.Q l mt in tch im m t ti O . M v N l hai im nm trong in trng ca Q vi OM=10cm v ON = 20cm. C h ra bt ngthc ng.

A. VM< VN< 0. B. VN< VM< 0. C. VM> VN> 0. D. VN> VM> 0.41.Biu thc no di y l biu thc nh ngha in dung ca t in.

A. F/q. B. U/d. C.MA /q. D. Q/U.

Cu 284.q l mt tua giy nhim in dng; q l mt tua giy nhim in m.K l mt thc nha. N gi ta thy K ht c c q ln q . Kc nhim in nh th no.

A. K nhim in dng. B. K nhim in m.C. K khng nhim in. D. Khng th xy ra hin tng ny.

Cu 285.T in c in dung C1c in tch q1= 2.10-3C . T in c in dung C2c in tch q2=1.10

-3C Chn khng nh ng v in dung

cc t in.A. C1> C2. B. C1= C2. C. C1< C2. D. C ba trng hp A,B,C u c th xy ra.

Cu 286.Di chuyn mt in tch q t im M n im N trong mt in trng .Cng AMNca lc in cng ln nuA.ng i MN cng di. B. ng i MN cng ngnC.hiu in th UMNcng ln. D. hiu in th UMNcng nh.

Cu 287.Chn cu ng. Ti hai im MP (i din nhau) ca mt hnh vung MNPQ cnh a t hai in tch im qM= qP= - 3.10-6C . Phi t

ti Q mt in tch q bng bao nhiu in trng gy bi h ba in tch ny ti N trit tiu.

A. q = 6 2 .10-6C. B. q = -6 2 .10-6C. C. q = 6.10-6C. D. q = -6.10-6C.

Cu 288.Chn cu ng. Hnh vung ABCD cnh a = 5 2 cm. Ti hai nh A,B t hai in tch im qA=qB= -5.10-8C th cng in

trng ti tm 0 ca hnh vung c.A.hng theo chiu AD v c ln E = 1,8.105V/m

B. hng theo chiu AD v c ln E = 9.105

V/mC. hng theo chiu DA v c ln E = 1,8.105V/mD. hng theo chiu DA v c ln E = 9.105V/m

Cu 289.Chn cu ng. Hai in tch im q1=2.10-6 C v q2=-8.10

-6C ln lt t ti A v B vi AB=a=10cm. Xc nh im M trn ng

AB ti 2 1E 4E .

A. M nm trong AB vi AM = 2.5cm. B. M nm trong AB vi AM = 5cm.C. M nm ngoi AB vi AM = 2.5cm. D. M nm ngoi AB vi AM = 5cm.

Cu 290.Mt t in khng kh phng c in dung C= 5F mc vo ngun in c hiu in th U=20V. Nng lng in trng trong t inbng.

A. 1 mJ. B.10mJ C.100mJ D.1J


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Cu 291.Mt t in khng kh phng mc vo ngun in c hiu in th U = 200V. Hai bn u in cch nhau d = 4mm. Mt nng ln gin trng trong t in bng.

A. 0,011 J/m3 B. 0,11J/m3 C. 1,1 J/m3 D. 11J/m3Cu 292.Mt t in phng gm hai bn kim loi phng t song song trong khng kh. t vo hai u t mt ngun in khng i c hiu inth U = 50V . Sau , ngt t khi ngun v nhngt vo trong du c hng s in mi = 2 th hiu in th gia hai bn t.

A. 25V. B. 50V. C.100V. D. 75V.Cu 293.Xt mi quan h gia in dung C v hiu in th ti a Umaxc th t gia hai bn ca mt t in phng khng kh. Gi S l din tchcc bn, d l khong cch gia hai bn.

A.Vi S nh nhau. C cng ln th Umaxcng ln. B. Vi S nh nhau. C cng ln th Umaxcng nh.C.Vi d nh nhau. C cng ln th Umax cng ln. D. Vi d nh nhau. C cng ln th Umax cng nh.

Cu 294.Ba t in c in dung C1= 30 F, C2= 20F, C3= 10F c mc ni tip nhau. in dung ca b t in bngA.. 60F B. 30F C. 105F D. 60/11 F.

Cu 295.Ba t in c in dung C1=30F , C2=20 F , C3=10F c mc song song nhau. in dung ca b t in bngA.. 40F B. 60F C. 120F D. 20 F

Cu 296.Khi mt in tch q= -2C di chuyn t im M n mt im N trong in trng th lc in sinh cng-6J. Hi hiu in th UMNbngbao nhiu.

A. 12V. B.12V. C. +3V. D. -3V.Cu 297.Tm cu pht biu ng v mi quan h gia cng ca lc in v th nng tnh in.

A. Cng ca lc in cng l th nng tnh in.

B. Cng ca lc in l s o bin thin th nng tnh in.C. Lc in thc hin cng dng th th nng tnh in tng.D. Lc in thc hin cng m th th nng tingx in gim.

Cu 298.Hai in tch y nhau bng mt lc F0khi t cch nhau 8 cm . Khi a li gn nhau ch cn cch 2cm th lc tng tc gia chng bygi l

A. F0 /2 B. 2F0 C. 4F0 D. 16F0Cu 299.Khi tng din tch i din gia hai bn t ln hai ln v gim khong cch gia hai bn t i mt na th in dung ca t in phng.

A. khng i. B. tng ln hai ln. C. tng ln bn ln. D. gim i bn lnCu 301.Chn cusai. C ba in tch im nm c nh trn ba nh ca mt hnh vung sao cho in trng nh th t bng khng. Nu vyth trong ba in tch .

A. C hai in tch dng, mt in tch m.B. C hai in tch m, mt in tch dng.

C. u l cc in tch dng.D. C hai in tch bng nhau, ln ca hai in tch ny nh hn ln ca in tch th ba.

Cu 302.Tm cu pht biu ng v mi quan h gia cng ca lc in v th nng tnh in. A. Cng ca lc in cng l th nng tnh in.B. Cng ca lc in l s o binthin th nng tnh in.C. Lc in thc hin cng dng th th nng tnh in tng.D. Lc in thc hin cng m th th nng tnh in gim.

Cu 303.Chn cu tr ling.Mt electron bay t im M n im N trong mt in trng, gia hai imc hiu in th UMN= 100V. Cngm lc in trng sinh ra s l.

A. 1,6.10-19J B. - 1,6.10-19J C. +100eV D. -100eVCu 304.trong cc cch nhim in .

I.Do c xt. II.Do tip xc III.Do hng ng

cch no th tng i s in tch trn vt c nhim in khng thay i.A.I B.II C.III D.khng c cch no

Cu 305.trong cc cch nhim in .I.Do c xt II.Do tip xc III.Do hng ng cch no th tng i s in tch trn vt c nhim in thay i.A.I,II B.II,III C.I,III D. khng c cch no

Cu 306.c nhng loi in tch noA.1 B.2 C.3 D.V s loi

Cu 307.Trong cc cch lm sau y.I.nhim in do hng ng II.chm tay III.ni t bng dy dn


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Mun lm cho qu cu A ang mang in tch m lm cho vt dn B mang in dng ta phi lm cch no. A.I,II B.I,III C.II,III D.C A v B u ng

Cu 308.Trong cc cht sau y .I.than ch II.dung dch bazo III.bonic IV.thy tinh

Cht no l cht dn inA.I,II B.II,III C.I D.I,IVCu 309.Trong cc cht sau y, cht no l cht cch in(in mi).

I. kim cng II.than chIII.dung dch mui IV.sA.I,II B.II,III C.I,IV D.III,IV

Cu 310.Hai qu cu nh ging nhau treo vo cng mt im bng hai dy t ging nhau ,truyn cho hai qu cu hai in tch cng duq1,q2viq1=2q2,hai qu cu y nhau.Gc lch ca dy treo hai qu cu tha mn h thc no sau y.

A.1 22 B. 2 12 C. 1 24 D. 1 2

Cu 311.Biu thc ca nh lut Coulomb v tng tc gia hai in tch ng yn trong chn khng l.

A. 1 22

q qF k

r B. 1 2

q . qF k

r C. 1 2

2

q . qF k

r D. 1 2

q . qF

r

Cu 312.Biu thc ca nh lut Coulomb v tng tc gia hai in tch ng yn trong mt in mi l.

A. 1 22

q qF k

r

B. 1 2

q . qF k

r

C. 1 2

2

q . qF k

r D. 1 2

q . qF

r

Cu 313.lc tng tc gia hai in tch im ng yn trong chn khng s thay i nh th no nu ta t mt tm knh xen gia haiin tch.A.phng,chiu, ln khng i B. phng chiu khng i , ln gimC. phng chiu khng i, ln tng D. phng chiu thay i theo v tr tm knh, ln gim

Cu 314.a vt A mang in dng ti gn mt qu cu kim loi nhtreo bng mt dy t th ta thy vt A ht qu cu.T kt qu ny ta c ktlun.

A.qu cu mang in m C.c tng tc gia vt mang in v vt khng mang inB.qu cu nhim in do hng ng D.A hoc B

Cu 315.Trong cc yu t sau.I.du ca in tch II. ln ca in tch III.bn cht ca in mi IV.khong cch gia hai in tch ln ca lc tng tc gia hai in tch im ng yn ph thuc vo cc yu t. A.II,IV B.I,II,IV C.II,III,IV D.I,II,III,IV

Cu 316.Trong cc cch nhim in .

I.do c xt II.do tip xc III.do hng ng cch nhim in no th c s dch chuyn electron t vt ny sang vt khc.A.I,II B.II,III C.I,III D.I,II,III

Cu 317.Xt 4 trng hp sau.I.vt A mang in dng t gn mt qu cu bng nhm II. vt A mang in dng t gn mt qu cu bng thy tinh

III. vt A mang in m t gn mt qu cu bng nhmIV. vt A mang in m t gn mt qu cu bng thy tinh trng hp no c s nhim in ca qu cuA.I,II B.III,IV C.I.III D.I,II,III,IV

Cu 318.Cho 4 gi tr sau.I.2.10-15C II. -1,8.10-15C III. 3,1.10-16C IV. -4,1.10-16CGa tr no c th l in tch ca mt vt b nhim inA.I,III B.III,IV C.I,II D.II,IV

Cu 319.Hai qu cu kim loi ging nhaumang ccin tch q1>0,q2q2 .Cho hai qu cu tip xc nhau ri tch ra.in tch ca mi qucu sau c gi tr.

A.Tri du,c cng ln 1 2q q

2

B.Tri du,c cng ln 1 2

q q

2

C.Cng du,c cng ln 1 2q q

2

D.Cng du,c cng ln 1 2

q q

2

Cu 320.Khi mt da tch in dng c a li gn mt in nghim tch in m th cc l ca in nghim s. A.xe hn B.cp btC.tr thnh tch in dng D.gi nguyn khng thay i

Cu 321.Mt qu bng cao su c c xt vi o len sau c p vo tng th s dnh vo tng. l v.


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23

A.s c xt lm sch lp bn b mt cho php bng tip xc tt vi tng ti mc p sut khng kh p cht n vo tngB.s cxt lm qu bng nhim in v cc in tichs trn qu bng lm xut hin cc in tch tri du trn tng.in tch tren qu bng v

in tch cm ng trn tng ht nhau lm qu bng gi cht vo tngC.tng tch in ,cn qu bng b nhim in v c xt.Do nu tng nhim in tri du vi in tch ca qu bng th qu bng s b gi

cht vo tngD.s c xt to ra nhng ch tp trung m trn qu bng v sc cng b mt lm qu bng b gi cht vo tng

Cu 322.Hai vt c th tc dng lc in vi nhau.A. ch khi chng u l vt dn B. ch khi chng u l in miC. ch khi mi vt mang in tch khc 0 D. ngay c khi ch mt trong hai vt cha in tch

Cu 323.Mt vt kim loi cch in khi cc vt khc c tch in .Chovt kim loi chm vo a c mt u c cm trong tay.Hi pht biuno sau y l ng.

A. Nu vt kim loi khng truyn c in tch cho a th a l mt cht cch in tt B. Nu vt kim loi mt in tch mt cch chm chp th a l mt cht cch in kmC. Nu vt kim loi mt nhanh in tch th a l cht dn in ttD. Tt c pht biu trn u ng

Cu 324. Hai qu cu kim loi ging ht nhau c tch in v c treo bng hai dy.Thot u chng ht nhau.Sau khi chng chm nhaungi ta thy chng y nhau.Nh vy trc khi va chm ta c.

A. c hai qu cu u tch in dngB. c hai qu cu u tch in dngC. c hai qu cu tch in c ln bng nhau nhng tri du

D. c hai qu cu tch in c ln khng bng nhau v tri duCu 325.Hai qu cu ging nhau c tch in c ln bng nhau nhng tri du.Sau khi c cho chm vo nhau ri tch ra th chng.

A.lun y nhau C.c th ht nhau hoc y nhau ty trng hpB.lun ht nhau D.trung ha v in

Cu 326.Hai qu cu nh khi lng bng nhau treo bng dy t c tch in nn lc tc dng lm dy chng lch i nhng gc bng nhau viphng thng ng.Hin tng chng t.

A. cc qu cu tch in bng nhau v tri duB. cc qu cu tch in tri du nhng khng nht thit bng nhauC. mt qu cu tch in cn mt qu th khngD. cc qu cu tch in bng nhau v cng du

Cu 327.Hai in tch m nh nhau t trn trc x.Nu mt in tch th dng t ti trung im ca chng th in tch th ny s. A. chuyn ng thng khi chuyn ng trn mi trc

B. ch chuyn ng thng khi chuyn ng trn trc xC. ch chuyn ng thng khi chuyn ng trn trc y hoc zD. chuyn ng thng khi chuyn ng trn trc vung gc vi trc z

Cu 328.Mt in tch m th.A. ch tng tc vi in tch dngB. ch tng tc vi in tch dngC. c th tng tc vi c in tch m ln in tch dngD. lun lun c th chia thnh hai in tch m bng nhau

Cu 329.Chn cusaitrong cc cu sau.A. trc v sau mt vt nhim in ,tng i s cc in tch trn vt lc sau lun lun khc lc u B. trong mt h c lp v in tng i s cc in tch lun lun l mt hng sC. trong s nhim in do c xt,s xut hin ca in tch m trn vt ny lun lun km theo s xut hin in tch dng c cng ln trn

vt kiaD. in tch ca mt vt nhim in lun lun l bi s nguyn ca in tch nguyn t

Cu 330.Chn cc cm t in vo ch trng cho hp ngha.Lc tng tc gia hai in tch im ng yn trongt l nghch vi t l viLc tng tc ctrng vi ng

thng ni hai in tchA. chn khng,bnh phng khong cch gia chng,tch ln cc in tch ,chiuB. in mi, bnh phng khong cch gia chng,tch ln cc in tch,phngC. chn khng,khong cch gia chng, tch ln cc in tch,phngD. chn khng,bnh phng khong cch gia chng,tch hai khi lng cc din tch,phng

Cu 331.Hng s in mi ca mi trng ph thuc vo.


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24

A. ln cc in tchB. ln v khong cch gia cc in tchC. khong cch gia cc din tch v tnh cht in miD. ln cc in tch v tnh cht in mi

Cu 332.Electron chuyn ng xung quanh ht nhn nguyn t Hidro theo qu o trn bn knh qu o R=5.10-11.Khi lng ca electron lme=9.10

-31kg1. ln lc hng tam tc dng ln electron l.A. 4,5.10-7N B. 9.10-8N C. 9.10-7N D. 4,5.10-8N2. ln vn tc ca electron l.A. 2,2.104m/s B. 2,2.106m/s C. 2,2.107m/s D. 2,2.108m/s

Cu 333.Hai in tch im q1va q2t cch nhau mt khong d=30cm trong khng kh,lc tng tc gia chng l F.Nu t chng trong duth lc ny yu i 2,25 ln. lc tng tc gia chng vn l F th cn dch chuyn chng mt khong l .

A. 0,1cm B. 1cm C. 10cm D. 24cmCu 334.Hai ht mang tch bng nhau chuyn ng khng ma st dc theo trc xx,trong khng kh.Khi hai ht ny cch nhau 2,6cm th gia tc caht 1 l a1=4,41m/s

2,ca ht 2 l a2=8,4m/s2.Khi lng ca ht 1l m1=1,6g.Hy tm.

1. in tch ca mi ht l.A. 7,28.10-7C. B. 8,28.10-7C C. 9,28.10-7C D. 6,28.10-7C2.Khi lng ca ht 2 l.A. 7,4.10-4kg B. 8,4.10-4kg. C. 9,4.10-4kg D. 8,1.10-4kg

Cu 335.Hai qu cu kim loi ging nhau c khi lng m=0,1g c treo vo cng mt im bng hai si dy c cng chiu di l=10cm.Truynmt in tch Q cho hai qu cu th chng tch ra v ng cn bng khi dy treo hp vi phng thng ng mt gc 150.

1.Lc tng tc tnh in gia hai qu cu l.A. 26.10-5N. B. 52.10-5N C. 52.10-6N D. 26.10-6N2.Sc cng ca dy v tr cn bng l.A. 103.10-5N. B. 103.10-4N C. 74.10-5N D. 52.10-5N3. in tch c truyn l.A. 7,7.10-9C B. 17,7.10-9C. C. 21.10-9C D. 27.10-9C

Cu 336.Hai qu cu nh hon ton ging nhau,mang in tch q1,q2t trong chn khng cch nhau 20cm th ht nhau bng lc F1=5.10-7N.t

vo gia hai hai qu cu mt tm thy tinh dy d=5cm,c hng s in mi =4 .Tnh lc tc dng gia hai qu cu khi .A.1,2.10-7N B. 2,2.10-7N C. 3,2.10-7N. D. 4,2.10-7N

Cu 337.Hai qu cu ging nhau,tch in nh nhautreo hai u A,Bca hai si dy c di bng nhau t trong chn khng. Sau tt c cnhng trong du c khi lng ring

0

,hng s in mi l =4 th thy gc lch khng i so vi trong khng kh.Bit qu cu c khi lng

ring l . Nh vy ta phi c.

A.0

1

2

B.

0

2

3

C.

0

5

2

D.

0

4

3

.

Cu 338.C hai git nc ging nhau,mi git cha mt electron d . Hi bn knh R ca mi git nc phi l bao nhiu lc tnh in bnglc hp dn gia chng. Cho bit G=6,68.10-11N.m2.kg-2, =1000Kg.m-3

A.0,01mm B.0,05mm C.0,06mm D.0,076mm.Cu 339.Hai qu cu kim loi nh t cch nhau mt khong l r =2cm y nhau bng lc F = 4,14N. ln in tch tng cng ca hai vt l5.10-5C.in tch cami vt l.

A. 0,46.10-5C v 4.10-5C B. 2,6.10-5C v 2,4.10-5CC. 4,6.10-5C v 0,4.10-5C. D. 3.10-5C v 3.10-5C

Cu 340.hai qu cu kim loi nh hon ton ging nhau mang in tch lc u l q1=3.10-6

C , q2=10-6

C. Cho chng tip xc nhau ri t cch nhau5cm trong khng kh. Lc tng tc gia chng l.A. 1,44N B. 2,88N C. 14,4N. D. 28,8N

Cu 341.Tng ln cc in tch dng v cc in tch m trong 1cm3kh Hidro iu kin tiu chun.A.Q+=Q-=3,6C B.Q+=Q-=5,6C C.Q+=Q-=6,6C D.Q+=Q-=8,6C

Cu 342.Hai qu kim loi ging nhau mi qu c in tch Q v khi lng m =10g, treo bi hai dy c cng chiu di l = 30cm vo cng mtim.Gi qu cu I c nh theo phng thng ng,dy treo qu cu II s lch 600so vi phng thng ng nh hnh v. Tm Q.

A. 10-6C B. 10-7C C. 10-8C D. 10-9CCu 343.Hai in tch im q1v q2= 4.q1t c nh ti hai im A, B cch nhau mt khong a. Hi phi t in tch q u n cn bng.

A. trn ng AB cch A l a/3 B. trn ng AB cch Al aC. cch A mt on l a/3 D. trn ng AB cch B l 3a


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Cu 344.Kt lun no sau y l ng. Cng in trng ti mt im.

A. cng phng vi lc in F tc dng ln in tch q t ti im B. t l nghch vi in tch q

C. lun lun cng chiu vi lc in F D. t l nghch vi khong cch r

Cu 345.Kt lun no sau y lsai.A. cc ng sc l do in trng to ra

B. hai ng sc khng th ct nhauC. qua bt k im no trong in trng cng c th v c mt ng scD. ng sc ca in trng tnh khng khp kn

Cu 346.Kt lun no sau y l sai.A. cng in trng l mt i lng vec-tB. nhng im khc nhau trong in trng ,cng in trng c th khc nhau v ln, phng ,chiu

C. do lc tc dng F tc dng ln in tch q t ti ni c cng in trng E l F q.E nn F v E cng hngD. mi in tch ng yn th xung quanh n c in trng tnh

Cu 347.Cu no sau y sai khi ni v cng in trng ti mt im do in tch Q gy ra cch n mt khong r s. A. t l vi ln in tch Q B. t l nghch vi rC. hng xa Q nu Q>0 D. c phng ni Q v im

Cu 348.Cng in trng ca mt in tch im Q ti im cch n mt khong r c ln l.

A.2

QE k.

r

B.

2

.QE k.

r

C.

2

QE k.

.r

D.

2

QE k.

.r

Cu 349.Trong cc trng hp sau , cng in trng ti cc im khc nhau c th c hng nh sau.A. cc im nm trn ng thng qua in tch im c lpB. cc im nm trong in trng ca h hai in tch im hon ton ging nhauC. cc im nm trong mt in trng uD. c A v C u ng

Cu 350.Xt cc trng hp sau.I. im A, B trn cng mt ng thng i qua mt in tch im c lp hai bn in tch II. im A v B trn cng mt ng thng i qua mt in tch im c lp cng pha so vi in tch III. hai im A v B trong mt in trng u

trng hp no th cng in trng ti hai im A v Bc cng hng.A.I B.II C.III D.II,IIICu 351.Mt qu cu kim loi bn knh r mang in tch Q>0 t c lp trong chn khng.Cng in trng ti mt im cch tm qucumt khong d l.

A.2

QE k.

d B.

2

QE k.

d r

C.

QE k.

d r

D.

2

QE k.

d r

Cu 352.Trong cc vt dn l tng ,cc ht mang in c th chuyn ng t do.Do tnh cht ,coa ngi cn bng tnh in . A. in tch vt dn tch c s c phn b u khp th tch vt B. c mt in trng khc 0 khp th tch ca vtC. c mt in trng bng 0 khp th tch ca vtD. vt dn khng th tch in

Cu 353.in trng ti mt im trong khng gian gn mt in tch l.A. lc do mt in tch tc dngvo in tch n v t ti im B. cng do mt in tch th n v sinh ra khi b cc lc a t v cng ti im C. lc tnh in ti im D.cng chng li in lc mang mt in tch th t v cng ti im

Cu 354.Nu mt qu cu bng kim loi c tch in tch Q th in trng bn trong qu cu s.A.hng vo trong theo ng xuyn tmB.bng 0C.c gi tr bng gi tr ti im nm trn mt qu cuD.ph thuc vo v tr im bn trong qu cu

Cu 355.Gii thch no trongcc gii thch di y gii thch ng hin tng nh tia la quanh cc thit b c in th cao(chng hn bin th).


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26

A.khi in trng mnh th n tr thnh c th trong thy c,trong tia mu hng l tia d thy nht v n gn vi tiacc tm,tc l tia cnng lng ln nht trong s cc tia sng thy c

B. in trng mnh gia tc cc e-v cc ion t c vn tc ln.Cc ht ny va chm vi cc phn t khng kh.Ti lt mnh cc ionkhng kh li c gia tc ,mt s ion v e-ti hp vi nhau v pht ra bc x nhn thy c mu xc nh

C. cc e-vn khng nhn thy c th by gi trong iu kin tp trung cao li c th nhn thy c .S d c s tp trung cao v cin thcao

D. in trng mnh hi t nh sng li .Tia mu hng nhn thy c ch l s hi t nh snh m iu kin bnh thng khng th nhnthy cCu 356.Chn pht biu ng. Ti im P c in trng,t in tch th q1ti P ta thy c lc in F1tc dng ln q1;thay q1bng q2th c lc F2tc dng ln q2 v F2khc F1 v du v ln.iu l do.

A. khi thay q1bng q2th in trng ti P thay iB. do q1v q2ngc du nhauC. do hai in tch th q1v q2c ln v du khc nhauD. do ln ca hai in tch th khc nhau

Cu 357. Chn cusai. C ba in tch nm c nh ti 3 nh ca mt hnh vung,ngi ta thy rng in trng ti nh cn li bng 0.Nh vyth trong 3 in tch .

A.c hai in tch dng ,mt in tch mB. c hai in tch m ,mt in tch dngC.tt c u l in tch dngD.c hai in tch bng nhau, ln ca hai in tch ny nh hn ln ca in tch th ba

Cu 358.Chn cung. Ti A c in tch im q1,ti B c in tch im q2.Ngi ta tm c mt im M m ti intrng bng 0.Mnm trn ng thng ni A,B v gn A hn B.Ta c th ni c g v cc in tch q1,q2

A. q1,q2cng du, 1 2q q B. q1,q2,khc du 1 2q q

C. q1,q2cng du, 1 2q q D. q1,q2,khc du 1 2q q

Cu 359.Tnh cht c bn ca in trng l.A.in trng gy ra cng in trng ti mi im trong nB.in trng gy ra in th tc dng ln mt in tch t trong nC. in trng gy ra ng sc in ti mi im t trong nD. in trng gy ra lc in tc dng ln in tch t trong n

Cu 360. Cu no ng khi ni v vec t cng in trng.

A.vec t cng in trng E cng phng v cng chiu vi lc F tc dng ln mt in tch th t trong in trng B. vec t cng in trng E cng phng v ngc chiu vi lc E tc dng ln mt in tch th t trong in trng

C. vec t cng in trng E cng phng v cng chiu vi lc E tc dng ln mt in tch th dng t trong in trng

D. vec t cng in trng E cng phng v ngc chiu vi lc E tc dng ln mt in tch th dng t trong in trng Cu 361.Trong cc quy tc v ng sc in sau y,quy tc no sai.

A.ti mt im bt k trong in trng ni chung ta ch c th v c mt ng sc i qua im B.cc ng sc ni chung xut pht in tch m, tn cng in tch dngC.cc ng sc khng ct nhauD.ni no cng in trng ln hn th ta v cc ng sc dy hn

Cu 362.Chn cusai.A.in ph cho ta bit s phn b cc ng sc in trngB.ni chung cc ng sc ni chung xut pht in tch dng, tn cng in tch mC.khi mt in tch chuyn ng trong in trng t im M n im N th cng ca lc in trng cng ln khi qung ng i t M n

N ca in tch cng diD.cc ng sc ca in trng u l cc ng thng song song v cch u nhau

Cu 363.qu cu kim loi bn knh 4cm mang in tch q=5.10-8C.1.Cng in trng trn mt qu cu v ti im M cch tm qu cu 10cm l.A.1,9.105V/m ; 36.103V/m B. 2,8.105V/m ; 45.103V/m.C.2,8.105V/m ; 67.103V/m D.3,14.105V/m ; 47.103V/m2. in th trn mt qu cu v ti im M cch tm qu cu 10cm l.A.11,250V ; 4500V. B.5250V ; 650V C.6410V ; 3312V D.11250V ; 3625V

Cu 364.Chn cu sai.


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27

A.cng in trng l i lng vec t c trng cho s tng tc ca din trng ln in tch t trong nB.cc ng sc in trng hng v pha in th tngC.trong in trng u cng in trng ti mi im u nh nhauD. trong in trng u cc ng sc song song nhau

Cu 365.Bn mt electron i vo gia hai bn ca mt t in phng th qu do electron gia hai bn l. A.ng thng B.ng parabol hng v bn dngC. ng parabol hng v bnm D.mt cung ng trn

Cu 366.Mt ngi hon ton cch in vi mt t v c ni vi mt my pht tnh in th tc gi y s xe ra. l do.A. ngi y c tch in y tc ra xaB. c th cha nhiu nc cn tc kh nn tch in v xe raC. c th l vt tch in nn tc xe ra theo ng sc ca in trng D. in tch cng tn thng y nhau i ra xa v phn b nhng mi nhn ca vt nn tc c tch in cng du v y nhau nn xe ra

Cu 367.Tnh cht c bn ca in trngl.A.tc dng lc in ln in tch t trong n B.gy ra tc dng lc ln nam chm t trong nC.c mang nng lng rt ln D.lm nhim in cc vt t trong n

Cu 368. c trng cho in trng v phng din tc dng lc ngi ta dng.A.ng sc in trng B.lc in trngC.nng lng in trng D.vec t cng in trng

Cu 369.trong h SI n v cng in trng l.A.V/C B.V C.N/m D.V/m

Cu 370.Cc in tch q1v q2gy ra ti M cc in trng tng ng l E1vE2vung gc vi nhau.Theo nguyn l chng cht in trng th ln ca cng in trng ti M l.

A.1 2E E E B. 1 2E E E C.

2 2

1 2E E E D. 1 2E E E

Cu 371.in ph cho bit.A. chiu ng sc in trng B. mnh hay yu ca in trngC. s phn b cc ng sc in trng D. hng ca lc in trng tc dng ln in tch

Cu 372.Cng in trng ca mt in tch im s thay di nh th no khi ta gim mt na in tch nhng tng khong cch ln gp i. A. tng 2 ln B. gim 2 ln C. khng i D. gim 4 ln

Cu 373.Nu ng sc c dng l nhng ng thng song song cch du nhau th in trng c gy bi.A. hai mt phng nhim in song song tri du B. mt in tch mC. h hai in tch im D. mt in tch dng

Cu 374.Cng ca lc in trng tc dng ln mt in tch chuyn ng t M n N s. A.cng ln nu on ng i cng ln B.ph thuc vo dng qu oC.ph thuc vo v tr cc im M v N D.ch ph thuc vo v tr M

Cu 375.C hai in tch ging nhau q1=q2=10-6C t ti hai im A v B trong chn khng cch nhau mt on 6cm trong mt mi trng c

hng s in mi =2.Cng in trng nm trn ng trung trc ca on AB ti im M cch AB mt khong 4cm c ln l.A.18.105V/m B.36.105V/m C.15.106V/m D.28,8.105V/m

Cu 376.Ti 3 nh ca tam gic u ABC c 3 in tch im ng yn q1,q2,q3.Cng in trng ti trng tm G ca tm gic bng 0.Taphi c.

A. q1=q2=-q3 B. q1=q2=-q3/2 C. q1=q2=q3 D. q1=q2=-q3/2Cu 377.Bn in tch im c cng ln q t 4 nh hnh vung cnh a.Du ca cc in tch ln lt l +, -,+,-.Cng in trng ti tmO ca hnh vung c ln .

A. 36.109. 2qa

B. 18.109. 2q 2a

C. 36.109. 2q 2a

D.0

Cu 378. C hai in tch q1=3.10-6C t ti B v q2 =64/9.10

-9C t ti C ca mt tam gic vung cn ti Atrong mi trng chn khng.BitAB=30cm,BC=50cm.Cng in trng ti A c ln.

A. 100V/m B. 700V/m C.394V/m D.500V/mCu 379.Mt in tch im q c t trong in mi ng tnh,v hn c =2,5.Ti im M cch q mt on l 0,4m in trng c cng 9.105V/m v hng v pha in tch q.Hi ln v du ca q.

A. -40 C B. 40 C C. -36 C D. 36 C Cu 380.Mt in tch th t ti dim c cng in trng l 0,16V/m.Lc tc dng ln in tch bng 2.10-4N. ln ca in tch l.

A.1,25.10-4C B. 1,25.10-3C C. 8.10-4C D. .10-2C


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Cu 381. in tch im q = -3.10-6C c t ti im m ti in trng c phng thng ng,chiu t trn xung di v cng E=12000V/m.Hi phng ,chiu v ln ca lc tc dng ln in tch q .

A. F c phng thng ng,chiu hng t trn xung, ln F=0,36N

B. F c phng nm ngang,chiu hng t tri sang phi, ln F=0,48N

C. F c phng thng ng,chiu hng t di ln trn, ln F=0,36N

D. F cphng thng ng,chiu hng t di ln trn, ln F=0,036N

Cu 382.C mt in tch q =5.10

-9

C t ti im A.Cng in trng ti im B cch A mt khong 10cm.A. 5000V/m B. 4500V/m C. 9000V/m D. 2500V/mCu 383.c hai in tch q1v q2 t cch nhau 10cm.in tch q1= 5.10

-9C, in tch q2= -5.10-9C. Xc nh vec t cng in trng ti im

M vi.1. nm trn ng thng i qua hai in tch v cch u hai in tch A.18000V/m B. 45000V/m C. 36000V/m D. 12500V/m2. nm trn ng thng i qua hai in tch v cch q15cm,cch q215cmA.4500V/m B.36000V/m C.18000V/m D.16000V/m

Cu 384.C hai in tch q1 v q2 t cch nhau 20cm nm ti hai im A v B.Bit q1= -9 C , q2= 4 C ,tm v tr M m ti in trngbng 0.

A.M nm trn AB gia q1v q2 ,cch q28cm B. M nm trn AB ngoi q2 ,cch q240cm.C. M nm trn AB ngoi q1,cch q240cm D. M nm trn AB chnh gia q1, q2 ,cch q210cm

Cu 385.C hai in tch q1v q2t cch nhau 8cm nm ti hai im A v B.Bit q1=-4 C ,q2=1 C ,tm v tr M m ti in trng bng 0.A.M nm trn AB ,cch q110cm, cch q218cm B. M nm trn AB cch q118cm ,cch q210cmC. M nm trn AB cch q18cm,cch q216cmD. M nm trn AB cch q1, 16cm,cch q28cm

Cu 386.C hai in tch q1v q2t cch nhau 24cm nm ti hai im A v B.Bit q1=4 C ,q2=1 C ,tm v tr M m ti in trng bng 0.A.M nm trn AB ,cch q110cm, cch q212cm B. M nm trn AB cch q116cm ,cch q28cmC. M nm trn AB cch q18cm,cch q216cmD. M nm trn AB cch q1, 10cm,cch q234cm

Cu 387.Ti 3 nh ca tam gic u ABC c cnh a=10cm t 3 in tch im ng yn q1=q2=q3=10nC.Xc nh cng in trng .1.ti trung im ca cnh BC ca tam gic l.A.0 B.2100V/m C.12000V/m D.6800V/m2.ti trng tm G ca tm gic.A.0 B.1200V/m C.2400V/m D.3600V/m

Cu 388.Mt in tch q =10-7C t trong in trng ca in tch dim Q,chu tc dng lc F=3.10-3N.Tnh cng in trng ti im dtin tch q v tm ln ca in tch Q.Bit rng hai in tch t cch nhau mt khong r=30cm .

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