搜索 - 科创

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若是铁氧体磁环，那么可以用1mm以上的漆包线绕制，若是什么铁硅铝差模磁环，也用1mm以上的漆包线绕（1mm指直径，线径……）绕多少圈你得用表去量，铁氧体磁环导磁率很‘严重’，只要绕几圈就可以了。

有一种魔术表演道具，就是用一块书这么大的方型磁铁，放置在非常水平的桌面上（实际使用时用两块三角劈来调整）然后在磁铁中心转动一个小的铁质或者磁铁质陀螺，用一块板慢慢将其托起，如果调好了的话就会稳定地漂在半空了

引用第3楼tom66于2008-08-19 02:32发表的 :原理是下面一个电机，用电位器控制转速,电机上装有磁铁一起转，磁铁接近上面的烧杯，用磁力带动烧杯里的一颗磁性搅拌子，搅拌子便转起来了。

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