Electromagnetic Induction is the process by which magnetic fields is used to produce voltage, and in a closed circuit, a current.
Faraday’s Law of Electromagnetic Induction states that, a voltage is induced in a circuit whenever relative motion exists between a conductor and a magnetic field and that the magnitude of this voltage is proportional to the rate of change of the flux.
Additionally, the induced current produced in a circuit always flows in such a direction that it opposes the change or the cause that produces it.