A coil is suspended in a uniform magnetic field, with the plane of the coil parallel to the magnetic lines of force. When a current is passed through the coil it starts oscillating, then it is very difficult to stop. But, if an aluminium plate is placed near to the coil, then it stops. This is due to
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D
Oscillating coil produces time varing magnetic field. Eddy current induced in aluminium plate create electromagnetic damping effect in coil.
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