A light disc made of aluminium (a nonmagnetic | vedclass

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(B) When the magnet is revolved above the disc,the magnetic flux linked with the aluminium disc changes continuously.According to Faraday's law of ele

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rotate in the same direction as the direction of magnet's motion

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(B) When the magnet is revolved above the disc,the magnetic flux linked with the aluminium disc changes continuously.According to Faraday's law of electromagnetic induction,this change in magnetic flux induces an electromotive force $(EMF)$ in the disc.Since the disc is a conductor,this induced $EMF$ causes eddy currents to flow within the disc.According to Lenz's law,these eddy currents will flow in such a direction as to oppose the cause producing them,which is the relative motion between the magnet and the disc.To oppose this relative motion,the disc experiences a torque that causes it to rotate in the same direction as the motion of the magnet.This phenomenon is known as Arago's disc experiment.

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