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电磁铁怎样退磁

更新时间: 2020-07-14 00:00:00     

1、加一与磁体原来磁化方向相反的、磁感应强度适当的外磁场。

2、把磁体置于一个强度逐渐减小的交变磁场中。

3、加热,使分子热运动加剧,磁铁因分子电流方向不一致而失去磁性。

关键词: 电磁铁 怎样

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