What is Lenz's Law?

In other words, the generated magnetic field always hinders the change of the original magnetic field. So if the original magnetic field increases, the induced magnetic field should be opposite; If the original magnetic field weakens, the induced magnetic field must be consistent with its direction to play a blocking role.

Come and refuse: it is another expression of Lenz's law, that is to say, if a magnet approaches you and the magnetic field becomes larger, if you want to stop it from getting bigger, that is refusal! (The specific repulsion method is to make the coil smaller and farther away from the magnet) Then if the magnet is far away from you, the induced magnetic field will decrease, and you will leave it (specifically, it is close to the magnet and tends to expand). ?

Extended data:

Lenz's law is a law of electromagnetism, which can be used to judge the direction of electromotive force produced by electromagnetic induction. It was discovered by Russian physicist Heinrich Friedrich Leng Ci 1834.

1834, the Russian physicist Heinrich lenz (H.F.E.Lenz, 1804- 1865) summed up a law for judging the direction of induced current, which is called lenz's law. Simply put, it is the law of "come and refuse", which is the main content of Lenz's law.

Lenz's law is the concrete embodiment of the law of conservation of energy in electromagnetic induction.

Just as Le Chatterley's principle in chemistry is the inertia theorem, Lenz's law is the inertia theorem of electromagnetic field. Le Chatterley's principle, Newton's first law and Lenz's law are essentially the same, all of which belong to the law of inertia, and there are also inertia theorems in the social field.

Lengci's description of this law seems to be directly related to the direction of induced current. However, to make a judgment, the direction of the induced current generated by the wire moving in the magnetic field must still be judged by "judging the current direction of the motor moving in the same way", so in fact, only the principle of judging the direction of the induced current is given, and the direction of the induced current must be judged according to certain procedures on the basis of fully grasping the principle of the motor.

References:

Baidu Encyclopedia-Lenz Law