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A conducting ring of radius r and resistance R rolls on a horizontal surface with constant velocity v. The magnetic field B is uniform and is normal to the plane of the loop. Choose the correct option.

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a
The induced emf between O and Q is Brv.
b
An induced current I=2 BvrRflows in the clockwise R direction.
c
An induced current I=2 BvrR flows in the anticlockwise R direction.
d
No current flows.

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detailed solution

Correct option is D

Induced emf between O and Q is12Bω2r2=Bω2r2=2BvrBut net induced emf in the ring will be zero. Hence no current flows in the ring.

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