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A ring made of insulating material is rolling without slipping on a horizontal surface with velocity of centre of mass \( V_{0} \). A conducting wire of length \( 2 R(R \) \( = \) radius of ring) is fixed between two points of the circumference. At an instant, the wire is in vertical position as shown in figure. \( A \) uniform magnetic field \( B \) exists perpendicular to the plane of the ring. The magnitude of emf induced between the ends of wire is
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