电磁感应现象中的“楞次定律”是一个教学难点 ,教师在教学中为了加强学生对楞次定律中描述到的“阻碍”二字的理解 ,往往会从导体和磁体间相对运动的角度去分析 (感应电流总要阻碍相对运动 ) .同时 ,辅以实验去说明 .传统的实验做法是用如图 1所示的装置来演示 :A和 B都是很轻 The “Leng’s Law” in the electromagnetic induction phenomenon is a teaching difficulty. In order to strengthen students’ understanding of the “impeded” word described in the Lenz’s law, the teacher often goes from the perspective of the relative movement between the conductor and the magnet. Analysis (induction current always hinders relative motion). At the same time, supplemented by experiments to illustrate. The traditional experimental practice is to use the device shown in Figure 1 to demonstrate: A and B are very light