A metallic ring of radius 1 m is placed in a uniform magnetic field of induction 1μT with its plane perpendicular to the direction of magnetic field. Now the radius of the ring is halved in a time interval of 0.1 second. Then average emf induced in the ring is
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A metallic ring of radius 1 m is placed in a uniform magnetic field of induction 1μT with its plane perpendicular to the direction of magnetic field. Now the radius of the ring is halved in a time interval of 0.1 second. Then average emf induced in the ring is