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Eddy currents

Currents flowing in closed loops, arising in a conductor moving in a magnetic field, or in a stationary conductor around which the magnetic field changes. Eddy currents arise due to Faraday’s law of magnetic induction and flow perpendicular to the plane of the magnetic field. They resemble eddies in water, hence their name. They are used in electromagnetic brakes. In thick conductors, e.g., transformer cores, eddy currents can lead to severe heating, so transformer cores are made of a series of insulated plates to limit the magnitude of the eddy currents.