Faraday's law of induction 
The time rate of change of flux in this expression may refer to any kind of flux change that takes place. If the change is motion of a conductor through a field, dΦ/dt refers to the rate of cutting flux. If the change is an increase or decrease in flux linking a coil, dΦ/dt refers to the rate of such change. It may refer to a motion or to a change that involves no motion. See Electromagnetic induction
A statement relating an induced electromotive force (emf) to the change in magnetic flux that produces it. For any flux change that takes place in a circuit, Faraday's law states that the magnitude of the emf ξ induced in the circuit is proportional to the rate of change of flux as in the expression below.
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