Question

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.

• A. The induced emf between $O$ and $Q$ is $Brv$
• B. An induced current $I=\frac{2Bvr}{R}$ flows in the clockwise direction
• C. An induced current $I=\frac{2Bvr}{R}$ flows in the anticlockwise direction
• D. No current flows
• E. answer required

Answer 1

The correct option is D No current flows

Since the magnetic field is uniform and normal to the plane of loop always, there is no change in flux through the ring due to its translation and rotation.

Thus there is no emf induced, and thus no current.