magnetics
DESCRIPTION
Y2 General Physics for NYMU Medical SchoolTRANSCRIPT
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12
A.
1.
a.
b. Hans Oersted
c.
2.
a.
b.
c. F = |q|vB sin .
d.
3.
4.
a.
b.
c.
B magnetic flux density.
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13
B.
1.
a.
b. cyclotron frequency.
c.
d.
(1)
(a)
(b) FB = qvB FE = qE v =
(2)
1. =V
2. =qvB =qE
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14
2.
a. l I B b. I B 0
c. [ ] =
3.
a.
b. =| |
c. d. Ps. Electric Dipole
C. Hall Effect
a.
b.
c.
d.
e.
a
b
x
I
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15
A.
(1)
(2)
(3)
(4) I P
a.
P
P
b.
(X=0)
l
c.n
P
I
I P
R
S N
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16
A. Faraday’s Law
N
Lenz’s Law
(1) v FB=qvB (2)
(1) r dr
(2)
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B.
B=00 =0
0
r < R
r > R
Path 1 B=0 Path 2
Path 3 B=0
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C. Displacement Current
1.
2. =0
3.
4. Displacement Current Density
5.
r < R
r > R
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19
D.
1.
2. E
3. Maxwell Equation
Qencl. =0
ic = 0
a. =0
b.
E. Eddy Current
1.
2.
b
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Inductance Henry = Wb/A = V x s/A = w x s = J/A2
.
1. Coil 1 Coil 2
2. Coil 2 Coil 1 i1
M21
3. dt
4.
5. M
6. M12 M21 M
7.
B.
Unit:
Self-induced emf
1. Self-induced emf En
2.
E = En + Ec = 0 Ec 0
3.
En a, b
ab Vab