楞次定律是确定闭合回路中感应电流方向的定律，通常的教科书中或教师演示楞次定律的基本方法是，用条形磁铁插入（或拔出）闭合线圈，观察电流计指针的偏转情况。这种方法在说明感应电流的效果总是反抗引起感应电流的原因这个问题上并不直观。下面介绍一种验证楞次定律的... The Lenz’s law is the law that determines the direction of the induced current in a closed loop. The basic method used in normal textbooks or by teachers to demonstrate Lenz’s law is to use a bar magnet to insert (or pull out) the closed coil and observe the deflection of the ammeter pointer. This method is not intuitive in explaining that the effect of the induced current is always against the cause of the induced current. Here’s a verification of Lenz’s law...