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Question

Two conducting rings P and Q of radii r and 2r rotate uniformly in opposite directions with centre of mass velocities 2v and v respectively on a conducting surface S. There is a uniform magnetic field of magnitude B perpendicular to the plane of the rings. The potential difference between the highest points of the two rings is


  1. 4 Bvr

  2. 8 Bvr

  3. 16 Bvr

  4. zero


Solution

The correct option is A

4 Bvr


VP+2BVr=VA
VQ2BVr=VB
                                ––––––––––––––––––
VAVB=4BVr as VP=VQ

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