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Two metallic rings A and B, identical i...

Two metallic rings ` A and B`, identical in shape and size but having different reistivities `rhoA and rhoB`, 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 `h_(A) and h_(B)`, repectively , with ` h_(A) gt h_(B)` . The possible relation(s) between their resistivities and their masses `m_(A) and m_(B)` is(are)

A

(a) `rho_(A) gt rho_(B) and m_(A) = m_(B)`

B

(b) `rho_(A) lt rho_(B) and m_(A) = m_(B)`

C

( c) `rho_(A) gt rho_(B) and m_(A) gt m_(B)`

D

( d) `rho_(A) lt rho_(B) and m_(A) lt m_(B)`

Text Solution

Verified by Experts

The correct Answer is:
B, D
As `(dphi)/(dt) = emf is the same`, the current induced in the ring will depend upon the resistance of the ring. Larger the resistivity, smaller the current.
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