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A nonconducting ring (of mass m, radius ...

A nonconducting ring (of mass m, radius r, having charge Q) is placed on a rough horizontal surface (in a cylindrical region with transverse magnetic field). The field is increasing with time at the rate R and coefficient of friction between the surface and the ring is `mu`. For ring to remain in equilibrium `mu` should be greater than equal to,

A

`(Qr^2R^2)/(2mg)`

B

`(QrR)/(2mg)`

C

`(Qr^2R)/(2mg)`

D

`(QrR^2)/(2mg)`

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