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; It is very difficult to stop. But if an aluminium plate is placed near to the coil, it stops. This is due to :

Question

development of air current when the plate is placed

induction of electrical charge on the plate

shielding of magnetic lines of force as aluminium is a para-magnetic material.

electromagnetic induction in the aluminium plate giving rise to electromagnetic damping.

Solution

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