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[" Two conducting rings "P" and "Q" of r...

[" Two conducting rings "P" and "Q" of radii rand "2" 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 "],[[" (A) zero "," (B) "4Bvr],[" (C) "8BVr," (D) "16Bvr]]

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