1 |
2 |
B2l2v |
2R |
2mgR |
B2l2 |
. |
I |
△ϕ |
2R |
Blh |
2R |
2qR |
Bl |
1 |
2 |
2mgqR |
Bl |
4m3g2R2 |
B4l4 |
1 |
2 |
2mgR |
B2l2 |
2mgqR |
Bl |
4m3g2R2 |
B4l4 |
A. | B. | C. | D. |
A.U=Bxlv,C点电势低于D点电势 |
B.U=Bxdv,C点电势高于D点电势 |
C.U=Bylv,C点电势低于D点电势 |
D.U=Bydv,C点电势高于D点电势 |
A.
| B.
| C.
| D.
|
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