Induction, Electromagnetic

According to Faraday’s law of electromagnetic induction, a time-varying magnetic field produces a corresponding electric field that is proportional to the time rate of change of the magnetic flux. In other words, alternating voltage applied to induction coil will result in the appearance of an alternating current in the coil circuit, which in turn, will produce in its surrounding area an alternating (changing) magnetic field that will have the same frequency as the coil current. The changing magnetic field induces eddy currents in the metal wire or cable that passes through induction coil. Induced eddy currents have the same frequency as coil current; however, their direction is opposite that of the coil current.