A metallic disc of radius 'R' is rotating about its geometrical axis with constant angular speed 'w' in external magnetic field B which is perpendicular to the plane of the disc then induced emf between the centre and any peripheral point of the disc is given by :- (1) wBR^2pi (2) wBR^2 (3) wBR^2pi/2 (4) wBR^2/2

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