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...1? ????F?BIL 2? ??????E=BLV 3? ???? f??qVBsin? ???B?V?????V?B??f?qVB? ????Ampere's force????????????????????????A·????????????????? ???? ?I????L??????? ????? ?B??????????? ......
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https://www.zhihu.com/question/6023094855
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https://zhidao.baidu.com/question/925574400276839139.html
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https://www.zhihu.com/question/49151553
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