Electromagnetic induction is a phenomenon that the guide body will produce electromotive force when it is placed in a changing magnetic flux. This electromotive force is called induced electromotive force or induced electromotive force. If this conductor is closed into a loop, this electromotive force will drive electrons to flow and form an induced current (induced current).
The law of electromagnetic induction is also called Faraday's law of electromagnetic induction:
Electromagnetic induction refers to the phenomenon of induced electromotive force due to the change of magnetic flux. For example, if a part of a conductor of a closed circuit cuts a magnetic induction line in a magnetic field, a current will be generated in the conductor. The generated current is called induced current, and the generated electromotive force (voltage) is called induced electromotive force? .
The direction of electromotive force in the law of electromagnetic induction can be determined by Lenz's law or right-hand rule. The content of the right-hand rule: stretch out your right hand so that your thumb is perpendicular to the four fingers, your palm faces the N pole of the magnetic field, the direction of your thumb is the same as that of the conductor, and the direction of the four fingers is the direction of the induced current in the conductor (the direction of the induced electromotive force is the same as that of the induced current).
Lenz's law points out that the magnetic field of induced current should hinder the change of original magnetic flux. In short, as the magnetic flux increases, the generated current tends to decrease; However, when the magnetic flux becomes smaller, the generated current often makes it larger.
The magnitude of induced electromotive force is determined by Faraday's law of electromagnetic induction; E(t)=-n(dφ)/(dt). The dynamic situation can also be found by E=BLV.