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Two conducting rings of radii `r` and `2r` move in apposite directions with velocities `2 upsilon` and `upsilon` 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
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`vv_(A)-4Bvr-4Bvr=v_(D)`
`V_(A)-V_(D)=8Bvr`
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