Faraday's law of induction is a basic law of electromagnetism relating to the operating principles of transformers, inductors, and many types of electrical motors and generators. The law states that:
The induced electromotive force (EMF) in any closed circuit is equal to the time rate of change of the magnetic flux through the circuit.
Or alternatively:
The electromotive force (EMF) generated is proportional to the rate of change of the magnetic flux.
See Also
induction
law of induction
Laws
Laws of Electrostatic Induction