怎么用右手看电磁铁正负极

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电磁铁的极不是正负极,是南北极。首先在电磁铁的线圈上画出电流的方向,然后将右手手掌摊平,除大拇指外的四个手指并拢,沿着线圈指向电流的方向,大拇指和其余四个手指方向垂直,则大拇指指的方向就是电磁铁北极(N极)的方向。

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