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在研究电磁感应现象中,常用到楞次定律.楞次定律可表述为:感应电流具有这样的方向,就是感应电流的磁场总要阻碍引起感应电流的磁通量的变化.在运用楞次定律时,许多学生不能准确把握“阻碍”二字的确切含义,常误认为,感应电流的磁场方向总是与引起感应电流的磁场(以下简称为“原来的磁场”)方向相反.
In the study of electromagnetic induction, Lenz’s law is commonly used. Lenz’s law can be expressed as: Induction current has such a direction, that is, the magnetic field of the induced current always hinders the change of the magnetic flux that causes the induced current. When using Lenz’s law, Many students cannot accurately grasp the exact meaning of the word “impeded.” It is often mistaken to assume that the direction of the magnetic field of the induced current is always opposite to that of the magnetic field that induces an electric current (hereinafter referred to as the “original magnetic field”).