Two conducting rings \( P \) and \( Q \) of radii \( r \) and \( 2 r \) rotate uniformly in oppo....

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Two conducting rings \( P \) and \( Q \) of radii \( r \) and \( 2 r \) rotate uniformly in opposite directions with centre of
\( \mathrm{P} \)
mass velocities \( 2 v \) and \( v \) respectively on a
W
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) zero
(2) \( 4 B v r \)
(3) \( 8 \mathrm{Bvr} \)
(4) \( 16 B v r \)


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