Lenz's law can also be expressed as: the role of induced current is always the reason to resist induced current. 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.
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.
Extended data:
Conditions of induced current in Lenz's law;
As long as the magnetic flux passing through the closed circuit changes, an induced current will be generated in the closed circuit. Therefore, "a part of the conductor in a closed circuit cuts the magnetic induction line, and the generated current is called induced current" is one-sided, and the conductor can generate induced current without cutting the magnetic induction line.
Judging the direction of induced current in Lenz's law;
Judgment method: use the right hand rule, that is, extend the right hand so that the thumb is perpendicular to the other four fingers and all of them are in the same plane with the palm; Let the magnetic induction line enter from the palm of your hand, with your thumb pointing in the direction of the line movement. At this time, the direction pointed by the four fingers is the direction of the induced current.
The direction of induced current is influenced by the direction of coil rotation and magnetic field. In electromagnetism, the right-hand rule mainly judges the direction that has nothing to do with force.
According to Lenz's law, the direction of the magnetic field generated by the induced current hinders the change of the original magnetic field, and then the direction of the current in the coil can be judged by using the right-hand spiral law.
Baidu Encyclopedia-Lenz Law