law of electromagnetic induction

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

law of induction
Laws of Electrostatic Induction

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