1. §11.3 感生电动势 涡旋电场
dt
d
ldE m
L
k
Φ
ε −=⋅= ∫
rr
0>
∂
∂
t
B
r
动生电动势
∫∫ ⋅×=⋅=
LL
k ldBvldE
rrrrr
)(εMotional emf
非静电力感生电动势
∫∫ ⋅=⋅=
LL
k ldldE
rrr
)?(εInduced emf
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3. difference
electrostatic fields are produced by static charges
vortex electric fields are produced by changing magnetic
field
涡旋电场 静电场与
divergeelectrostatic field 发散状
vortex electric field curl 涡旋状
either field will exert a force on a charge qEq
r
共同点
∫∫ ⋅=⋅=
L
i
L
k ldEldE
rrrr
ε
dt
d
ldE m
L
i
Φ
−=⋅∫
rr iE
r
vortex electric field
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5. betatron (电子感应加速器)
CAI
Electrons travel in a circular
orbit between the poles of a
large electromagnet.
Magnetic field varies in a
sine wave.
Only the first quarter
( ) is considered.0
d
d
>
t
B
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