判断感应电流的方向通常有以下三种方 法: 一、根据楞次定律判断感应电流方向 楞次定律的对象是闭合回路,适用于一般 的电磁感应现象(无论是由于导体运动还是磁 场随时间变化引起的),是判断感应电流(感应 电动势)方向的普遍适用规律．应用楞次定律 There are usually three methods for judging the direction of the induced current: 1. Judgement of the direction of the induced current according to Lenz’s law. The objective of Lenz’s law is a closed loop. It is applicable to general electromagnetic induction phenomena (whether due to conductor motion or magnetic field changes over time. ) is a general rule of application for determining the direction of induced currents (induction electromotive force). Apply Lenz’s Law