Question:
Consider a metal ring kept (supported by a cardboard) on top of a fixed solenoid carrying a current I. The centre of the ring coincides with the axis of the solenoid. If the current in the solenoid is switched off, what will happen to the ring?
Solution:
We know that the current was already flowing through the solenoid making it behave like a magnet such that the S pole is on the upper side. Therefore, there is no
induced current in the ring. When the current is turned off, there is a decrease in the magnetic flux such that the N pole is on the lower side and is attracted by the
solenoid.
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