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
Flux
law of electromagnetic induction
Law of Vibrating Atomolic Substances
Laws
Laws of Electrostatic Induction