“楞次定律”是电磁学的重要定律 ,也是高中物理教学的难点之一 .教师普遍感到难教 ,学生普遍感到难学 .笔者认为只要准确把握定律中“阻碍”一词的含义 ,这个难点是能够得到突破的 .“楞次定律”告诉我们 :感应电流具有这样的方向 ,即感应电流的磁场总要阻碍引起感应电流的磁? “Leng’s Law” is an important law of electromagnetism, and it is also one of the difficulties in high school physics teaching. Teachers generally find it difficult to teach and students generally feel difficult to learn. The author believes that as long as the meaning of the word “impeded” in the law is accurately grasped, this difficulty Is able to get a breakthrough. “Leng’s Law” tells us: The induced current has such a direction, that is, the magnetic field of the induced current always hinder the magnetic induction caused by the current?