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A wire is being wound around a rotating wooden cylinder of radius R. One end of the wire is connected to the axis of

A wire is being wound around a rotating wooden cylinder of radius R. One end of the wire is connected to the axis of the cylinder, as shown in the figure. The cylinder is placed in a uniform magnetic field of magnitude B parallel to its axis and rotates at N revolutions per second. What is the potential difference between the open ends of the wire? (a) 0 (b) 2NBR (c) NBR (d) BR/N

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