469. A wire loop with an area of S = 500 cm2 and a resistance of R = 0.1 Ohm rotates uniformly in a uniform magnetic field (B = 0.5 T). The axis of rotation lies in the plane of the ring and is perpendicular to the lines of magnetic induction. Determine the maximum power Pmax required for the rotation of the circuit with an angular velocity ω = 50 rad / s.