第90集《漂浮的磁球》

� **科学知识点总结****1. 磁悬浮原理（磁力平衡）*** 物体能悬浮，是因为磁场上下“推力”刚好平衡重力。* 任何外界磁场都会破坏平衡。**2. 热影响磁性（居里点原理）*** 金属受热会改变磁性，温度升高会让磁场变强或变弱。* 热水保温杯成了“不小心的磁场源”。**3. 弱磁干扰**

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第90集《漂浮的磁球》

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