In which of the following devices,the eddy cu | vedclass

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(D) Eddy currents are loops of electrical current induced within conductors by a changing magnetic field. They are utilized in induction furnaces for

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electric heater

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(D) Eddy currents are loops of electrical current induced within conductors by a changing magnetic field. They are utilized in induction furnaces for heating,magnetic braking systems in trains,and speedometers. An electric heater,however,operates on the principle of the Joule heating effect $(H = I^2Rt)$,where heat is produced by the resistance of a conductor to the flow of electric current,not by eddy currents.

In which of the following devices,the eddy current effect is not used?

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