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磁铁吸引大头针说明了什么

更新时间: 2020-10-02 00:00:00     

说明以下问题:

1、磁铁有磁性;

2、大头针是导磁材料做的;

3、有磁性的物体对导磁物体有力的作用。

磁铁吸引铁,钴,镍等物质的性质称为磁性。磁铁两端磁性强的区域称为磁极,一端为北极一端为南极,铁中有许多具有两个异性磁极的原磁体,在无外磁场作用时,这些原磁体排列紊乱,它们的磁性相互抵消,对外不显示磁性。

关键词: 磁铁 吸引 大头针 明了 什么

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