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 :

Engineering

Physics

Non Conservative Electric Field and Eddy Current

Question

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

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

development of air current when the plate is placed.

induction of electrical charge on the plate

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Oscillating coil produces time variable magnetic field. It cause eddy current in the aluminium plate which causes anti–torque on the coil, due to which is stops.