△B |
△t |
B-B0 |
△t |
△φ |
△t |
△BS |
△t |
(B-B0)S |
△t |
E |
r |
kl2 |
r |
(B0+kt1)kl3 |
r |
(B0+kt1)kl3 |
r |
(B-B0)l2 |
t-0 |
B0l |
l+vt |
kl2 |
r |
(B0+kt1)kl3 |
r |
B0l |
l+vt |
A.vm=(B2L2v-fR)/B2L2 | B.vm=(2B2L2v-fR)/2B2L2L |
C.vm=(4B2L2v-fR)/4B2L2 | D.vm=(2B2L2v+fR)/2B2L2 |
A.电荷量Q=
| ||||||
B.电荷量Q=
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C.绳对小球的拉力F=
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D.绳对小球的拉力F=
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