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Question

A coil is suspended in 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; it is very difficult to stop.but if an aluminium plate is placed near to the coil,it stops, this is due to:

A
Electromagnetic induction in the aluminium plate giving rise to electromagnetic damping
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B
Development of air current when the plate is placed.
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C
induction of electrical charge on the plate
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D
Shielding of magnetic lines of force as aluminium is a paramagnetic material.
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Solution

The correct option is D Shielding of magnetic lines of force as aluminium is a paramagnetic material.
(D) option is correct. The oscillating coil produces time variable magnetic field. It causes eddy current in the aluminium plate which causes anti-torque on the coil, due to which it stops. Thus, electromagnetic induction in the aluminium plate giving rise to electromagnetic damping.

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