Answer:
Faraday's law of induction
Explanation:
Faraday found that a when a conductor is placed in a varying magnetic field, an electromotive force is induced in the conductor. If there is a closed loop, a current is also induced.
Induced emf is proportional to time rate change of magnetuc flux.
[tex]e=\frac{-d\phi}{dt}=\frac{dB A}{dt}[/tex]
Motor and generator are based on this principle. Motor converts electrical energy to mechanical energy where as a generator converts mechanical energy to electrical energy.
