在第一个线圈中感应电流随着时间变化。
如果电流切断，线圈就返回到原来位置。
Should the current be cut, the coil would return to its original position.
如果磁棒单纯静止在线圈附近，就检测不到电流。
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。
If the bar magnet is simply held stationary near the coil, no current is indicated.
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