8/9/2019 Bi tp Hiu in th ca lp 11A7

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BI TP LP 11A7HIU IN TH

I.CN NH:

4 Cng ca lc in:

A = q Ed= qU

Cng khng ph thuc vohnh dng ng i m chph thuc vo v tr im uv cui.E: in trng do in tch Qgy ra.Anh quen em i.

4 Hiu in th:

U = Ed

II.BI TP:

Dng 1: Hiu in th

1 Hai bn tch in tri du c t song song cch nhau 5 mmtrong chn khng.

a. Nu t vo hai bn mt hiu in th U = 200 V th cng

in trng m chng to ra l bao nhiu?b. Nu cng in trng gia hai bn l 10000 V/m thhiu in th gia hai bn l bao nhiu?

2 Gia hai im A v B t cch nhau 0,5 mm trong khng kh cmt hiu in th U = - 100 V. Hy cho bit chiu v ln cavect cng in trng m AB to ra.

3 Cho mt tam gic ABC u cnh 2 cm t trong mt in trngu c E = 8000 V/m. Hy xc nh UAB, UBC, UCA trong cc trnghp sau:

a. Vect cng in trng hng t B n C.b. Vect cng in trng hng t A n cnh BC vvung gc vi BC.

Dng 2: Cng v hiu in th

4 Cho hai bn kim loi t song song cch nhau 5 mm. Hiu inth gia chng l 200 V. Hy tnh cng ca in trng a mtin tch im Q = 2.10-12 C i t bn dng sang bn m.

Bi tp lp 11A7 - Hiu in th"

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8/9/2019 Bi tp Hiu in th ca lp 11A7

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5 Mt in tch im q = +10C chuyn ng tnh B n nh Cca tam gic u ABC cnh 10cm. Tam gic ABC nm trong intrng u c cng 5000 V/m. ng sc ca in trng nysong song vi cnh BC v c chiu t B n C. Tnh cng trong cctrng hp sau:

a. q chuyn ng theo on thng BC chiu t B n C.b. q chuyn ng theo on thng BC chiu t C n B.c. q chuyn ng theo ng gp khc BAC. Xem cng ny

bng tng cng dch chuyn trn 2 on BA v AC.

6 Cho mt tam gic ABC u cnh 0,2 mm t trong mt intrng u E = 12000 V/m v c chiu hng t C n B. Hy tnhcng ca in trng khi dch chuyn mt in tch im q = - 3.10-10C i dc theo cc ng gp khc AB, ABC, CB.

7 Cn thc hin mt cng 2.10-10

J c th dch chuyn mt intch q = - 9.10-12 C i tim A n im B t trong mt in trngu. Hy xc nh hiu in th gia hai im AB.

8 dch chuyn mt electron dc theo mt hnh vung ABCD cnh1 mm theo qu o BCD, in trng cn thc hin mt cng3,2.10-17 J. Xc nh ln ca in trng, bit rng vect cng hng t C n D.

Dng 3: Ht chuyn ng trongin trng

9 Mt electron chuyn ng dc theo ng sc ca mt intrng u c cng 364 V/m. Electron xut pht tim M vivn tc 3,2.106 m/s theo hng ng sc in. Hi electron ic on ng bao xa th dng li?

10 Mt electron bt u chuyn ng t bn ny n bn kia ca mtin trng u E = 100 V/m di tc dng ca lc in. Hai bncch nhau 40 cm. Xc nh vect E v vn tc ca eletron khipvo bn kia ca in trng.

11 Mt git du khi lng 320 mg mang in tch dng q chuynng thng u trong mt in trng u E = 40000 V/m gia haitm kim loi t nm ngang. Xc nh vect cng in trngv s electron b mt ca git du.

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