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An aluminium ring hangs vertically from ...

An aluminium ring hangs vertically from a thread with its axis pointing east-west. A coil is fixed mear to the ring and coaxial with it.
What is the initial motion of the aluminium ring when the current in the coil is switched on?

A

moves toward `E`

B

moves toward `W`

C

moves toward `N`

D

moves toward `S`

Text Solution

Verified by Experts

The correct Answer is:
A
When the switch is closed, the current flows through the coil which sets up a magnetif flux `phi` through the ring. The motion of the ring will be such that, by Lenz's law, it opposes the sudden increase in flux linkage. Hence, the ring moves away from the coil or towards `E` (east).
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