AIEEE 2012 Solved Paper

Section: Physics

Question : 49 of 89

Marks: +1, -0

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:

[AIEEE 2012]

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.

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