Question

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:

विकल्प

• 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 paramagnetic material.

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

Answer 1

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

Explanation:

Because of the Lenz's law.

Al will experience an emf that opposes the emf's cause, an oscillating coil.