A vertical conducting ring of radius R falls vertically with a speed v in a horizontal uniform magnetic field B which is perpendicular to the plane of the ring–

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When the ring falls vertically, there will be an induced emf across A and B [e = Bv (2r)] Note that there will be a potential difference across any two points on the ring, line joining whom has a projected length in the horizontal plane. For example, between points 'P' and 'Q' there is a projected length 'X' in the horizontal plane.
Potential difference across P and Q is:
V = B vx.
But for points C and D : x = 0
Therefore, Potential difference = O.

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