Should the current be cut, the coil would return to its original position.
如果电流切断，线圈就返回到原来位置。
The coil converts the current into a powerful magnetic field.
线圈则产生强烈的磁场。
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.
如果磁棒单纯静止在线圈附近，就检测不到电流。
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