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用原副线圈来做电磁感应演示实验在很多教科书上都有,而且很简单,我们很多老师都做过,而且做过多遍。但有一现象需提醒大家注意。现象如图1所示,接好电路后闭合电键S,电表的指针应朝一个方向偏转一下,然后立即回到零点。而实验的实际结果却并非如此,电键闭合后电表的指针是朝一
The use of the original secondary coil for electromagnetic induction demonstration experiments has been found in many textbooks, and it is very simple. Many of our teachers have done it and it has been done many times. However, there is a phenomenon that needs attention. The phenomenon is shown in Fig. 1. After closing the circuit, close the key S. The pointer of the meter should be deflected in one direction and immediately return to zero. However, the actual result of the experiment is not the same. The pointer of the meter after the key is closed is towards