Two identical conducting rings \( A \) and \( B \) of radius \( r \) are in pure rolling over a ....

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Two identical conducting rings \( A \) and \( B \) of radius \( r \) are in pure rolling over a horizontal conducting
\( \mathrm{P} \)
plane with same speed (of centre of mass) \( v \) but in
W
opposite direction. A constant magnetic field \( B \) is present pointing inside the plane of paper. Then the potential difference between the highest points of the two rings is:
(1) zero
(3) \( 4 B v r \)
(4) None of these


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