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 the coil, it stops. This is due to
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 the coil, it stops. This is due to
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Eddy currents always oppose the cause producing them, leading to electromagnetic damping.
Updated On: Mar 20, 2026
- induced emf in the coil
- induction of electrical charge on the plate
- shielding of magnetic lines of force as aluminium is paramagnetic
- electromagnetic induction in the aluminium plate giving rise to electromagnetic damping
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The Correct Option is D
Solution and Explanation
Step 1: Motion of the coil changes magnetic flux through the aluminium plate.
Step 2: Eddy currents are induced in the plate.
Step 3: These currents oppose the motion (Lenz’s law), causing damping.
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