question_answer

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  Solved  Paper-2012

A)  developement of air current when the plate is placed.

B) induction of electrical charge on the plate

C) shielding of magnetic lines of force as aluminium is a paramagnetic material.

D) Electromagnetic induction in the aluminium plate giving rise to electromagnetic damping.

Correct Answer: D

Solution :