jumping ring | jee 2009 question | jee previous year question

Описание: Two metallic rings A and B identical in shape and size but having different resistivities ρA and ρB are kept on top of two idential solenoids as shown in the figure.When current II is switched on in both the solenoids in identical manner, the rings A and B jump to heights hA and hB respectively with hA gt hB. The possible relation(s) between their resistivities and their masses mA and mB is (are)

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