467. A frame containing N = 200 turns of a thin wire can freely rotate about an axis lying in the plane of the frame. Frame area S = 50 cm2. The axis of the frame is perpendicular to the lines of induction of a uniform magnetic field (B = 0.05 T). Determine the maximum EMF Emax, which is induced in the frame when it rotates with a frequency of n = 40 s-1.