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在解决感应电流、感应电流受力及由此引起的闭合回路变化时,用楞次定律解决问题,楞次定律中的“阻碍”是解题的关键。一般来说,应用楞次定律时,应先判断原磁场的方向变化情况,再根据感应电流的磁场阻碍原磁场变化的原则,判断出感应电流的磁场方向,然后利用右手定则判断感应电流或感应电动势。对于某些要判断闭合回路运动情况或变化情况的,还要根据左手定则判断受力情况再进一步判断.下面通过几个例子说明这个问题,以期对同学们的学习有所帮助.
In solving the problem of induced current, induced current stress, and the resulting closed loop changes, Lenz’s law is used to solve the problem. The “impediment” in Lenz’s law is the key to solve the problem. In general, when Lenz’s law is applied, the direction of the original magnetic field should be determined first. Then, based on the principle that the magnetic field of the induced current obstructs the change of the original magnetic field, the direction of the magnetic field of the induced current can be determined. Then, the induced current can be judged by using the right-hand rule. Induced electromotive force. For some to determine the closed loop movement or change, but also according to the left-hand rule to judge the force situation and then further judgment. The following examples illustrate this problem, in order to help students learn.