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Consider a metal ring kept (supported by...

Consider a metal ring kept (supported by a cardboard) on top of a fixed solenoid carrying a current I as per figure. 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 ?

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When the current in the solenoid is switched off the magnetic flux linked with metal ring will decrease and clockwise current will be induced in it, so the solenoid and the metal ring attract each other, hence the ring remains on the cardboard.
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KUMAR PRAKASHAN-ELECTROMAGNETIC INDUCTION-Section C Ncert Exemplar Solution (MCQs)
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  9. The mutual inductance M12 of coil 1 with respect to coil 2

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