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If DC is used the metal ring lifts up fa...

If DC is used the metal ring lifts up falls down immediately. Why?

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The flux linked with metal rings is zero. When the switch is on.at that instant there should be a change in the flux linked with ring.SO the ring rises up and falls down. It the switch is off.the metal ring again raises up and falls down. There is no charge in flux linked with ring when the switch is off.
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