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初二电磁感应?

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realnumber posted 2021-3-18 23:27 |Read mode
Last edited by hbghlyj 2025-4-24 05:11

直导线ab放在如图所示的水平导体框架上,构成一个闭合回路.长直导线cd和框架处在同一个平面内,且cd和ab平行,当cd中通有电流时,发现ab向左滑动.关于cd中的电流下列说法正确的是(B)
  • 电流肯定在增大,不论电流是什么方向
  • 电流肯定在减小,不论电流是什么方向
  • 电流大小恒定,方向由c到d
  • 电流大小恒定,方向由d到c

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色k posted 2021-3-18 23:59
向左滑动,面积增大,说明磁场在减少(所以它才要增大面积来对抗),故电流在减少,无论什么方向

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isee posted 2021-3-19 00:01
擦,看得懂,但说的什么已经不明了

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色k posted 2021-3-19 00:05
n年没撸物理,也不知有没有错,隐约记得有个什么定律大概是说出现的情况总是希望降低变化率……

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original poster realnumber posted 2021-3-19 07:29
嗯,也觉得是这个,阻止电流减弱

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hbghlyj posted 2021-3-19 20:41
回复 4# 色k
楞次定律

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色k posted 2021-3-19 21:59
回复 6# hbghlyj

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