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QJEEM12Phce47: JEE Main 2012 Physics - Class 12 JEEM12Phce47 Solution: A coil is suspended in a uniform magnetic field, with the plane …
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 :
Multiple Choice Options
- A development 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 para-magnetic material.
- D electromagnetic induction in the aluminium plate giving rise to electromagnetic damping.
Step-by-Step Verified Solution
Because of the Lenz's law of conservation of energy.