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A non conducting ring(mass m,radious r,having charge Q) is placed on a rough horizontal surface(in a cylindrical region with tranverse magnetic field ).The field is increasing with time at the rate R and the coefficient of friction b/w the surface and the ring is μ.For ring to remain in equilibrium μ should be greater than (1)Qr^2R^2/2mg (2)QrR/2mg (3)Qr^2R/2mg (4)QrR^2/2mg solver it and say how you have done?

A non conducting ring(mass m,radious r,having charge Q) is placed on a rough horizontal surface(in a cylindrical region with tranverse magnetic field ).The field is increasing with time at the rate R and the coefficient of friction b/w the surface and the ring is μ.For ring to remain in equilibrium μ should be greater than
(1)Qr^2R^2/2mg
(2)QrR/2mg
(3)Qr^2R/2mg
(4)QrR^2/2mg
solver it and say how you have done?

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