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 plane with same speed (of center of mass) \( v \) but in 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
(a) Zero
(b) \( 2 B v r \)
(c) \( 4 B v r \)
(d) None of these
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