Move a bar magnet near one or two coils to make a light bulb glow.
在一两枚硬币附近移动磁棒来让灯泡发光。
The magnetic state of a bar magnet or a horseshoe magnet is extremely complicated.
条形磁铁或马蹄形磁铁的磁态是极其复杂的。
If the bar magnet is simply held stationary near the coil, no current is indicated.
如果磁棒单纯静止在线圈附近，就检测不到电流。
A bar on horseshoe magnet is called a permanent magnet.
棒形或马蹄形磁体称为永磁体。
A bar on horseshoe magnet is called a permanent magnet.
棒形或马蹄形磁体称为永磁体。
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