1825年的一天,日内瓦年轻的物理学家得拉里夫的助手科拉顿正在实验室里做“磁生电”实验。他用导线绕成一个线圈,再用一个转动灵活的磁针来检查跟线圈相接的导线中是否有电流存在。他想,当用磁铁插入线圈里的时候,可能会在线圈中产生电流,为了避免磁铁对磁针的 One day in 1825, Coralton, the assistant of Geneva’s young physicist Tarriff, was doing a “magnetoelectricity” experiment in his laboratory. He used a wire to wind a coil, and then used a flexible needle to check if there was current in the wire that was connected to the coil. He thought that when using a magnet to insert a coil, it may generate current in the coil, in order to avoid the magnet to the magnetic needle