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

