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BITSAT 2017 Solved Question Paper

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Question : 20

Total: 150

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 :

developement 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 paramagnetic material.
electromagnetic induction in the aluminium plate giving rise to electromagnetic damping.

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