This current forms small loops in the disk (eddy currents) producing an opposing vertical magnetic flux in the area under the forward-facing edge of the permanent magnet. As the magnetic flux from the permanent magnet passes through an area of the disk, a current is induced in the conductive material by method of electromagnetic induction. At the forward-facing edge of the magnet, magnetic flux does not exist in the disk until the magnet passes over that area. For example, consider a permanent magnet placed just above a conductive disk so that the magnetic field passes through it, and the magnet is moved in a circular motion around the disk's radius. A Lorentz force is produced by the eddy current and the rotating magnetic field. ![]() When a rotating magnetic field traverses a conductive circular disk, eddy currents are induced in the disk.
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