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Induction

A soft iron rod is placed through the axis of a solenoid and an aluminium ring is threaded down the rod to rest on the solenoid. A constant d.c current is now turned on in the solenoid. What happens to the ring? The current is no turned off what happens now?

I assume intially if will stay resting on the solenoid as there is no change in flux cutting, so no current produced in the ring? Then when its swtiched of, the current will increase in the solenoid to oppose its change therefore will life the ring up? im not quite sure
At the instant the current is switched on, the ring will jump up, as there has been a change in current (from 0 to whatever the value is), so inducing a current in the ring. However, it will fall back down again as the current is not constantly changing.

Switching off the current will cause a change in current (from value to 0), so inducing a current in the ring and the ring will again jump up, before falling back again.

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