Answer:
In the same Fig. 4(EP).6,
when current in the solenoid is suddenly switched off, magnetic flux linked
with the solenoid and hence with metal ring decreases. Current induced in the
metal ring is clockwise, i.e., in the same direction as the solenoid current.
They will attract each Other. The metal ring, therefore, will remain on the
cardboard. However, reaction of cardboard on the ring will increase.
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