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好吧问答库 > 磁能会被消耗吗？磁铁周围有磁场，那磁性也不见得消失呀

磁能会被消耗吗？磁铁周围有磁场，那磁性也不见得消失呀

2025年03月15日 09:45

有1个网友回答

网友（1）：

简单的说，铁磁物体在磁铁附近移动或者磁铁本身移动时，机械能会跟磁能相互转换，具体就涉及大学电磁学内容了。
简单说，如果物体被磁铁吸引时，磁能减少，减少的能量用来吸引物体了。但如果把物体从磁铁上拿开时，磁能增加，增加的来源就是把物体拿开从外界输入的机械能。这里能量依然是守恒的，想靠磁铁实现永动机是不可能的。

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