如图所示,OP1Q1与OP2Q2是位于同一水平面上的两根金属导轨,处在沿竖直方向的匀强磁场中,磁感应强度为B,长度相等的导轨OP1段与OP2段相互垂直,交于O点.导轨的P1Q1与P2Q2段
则安培力的大小:FA=BI2L=B
BV | ||
(
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2B2bV | ||
(
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(3)根据动能定理得:WF-WA=0
WF=WA=
0+FAmax |
2 |
1 |
2 |
BV | ||
(
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B2Vb2 | ||
(
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(4)分两段讨论:
①0≤t≤
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S=
1 |
2 |
Bat | ||
(
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F1-BI1?2S=ma
F1=ma+
BV | ||
(
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2B2bV | ||
(
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0+FAmax |
2 |
1 |
2 |
BV | ||
(
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B2Vb2 | ||
(
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1 |
2 |
Bat | ||
(
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