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An aluminium ...

Question

An aluminium ring hangs vertically from a thread with its axis pointing east-west. A coil is fixed near 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 towards E

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B

Moves towards W

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C

Moves towards N

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D

Moves towards S

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Solution

The correct option is A Moves towards E
When the switch is closed,the current flows through the coil which sets up a magnetic flux $ϕ$ 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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