In figure, ABCD is a fixed smooth conducting frame in horizontal plane. T is a bulb of power 100 W, P is a smooth pulley and OQ is a conducting rod. Neglect the self inductance of the loop and resistance of any part other than the bulb. The mass M is moving down with constant velocity 10 m s-1. Bulb lights at its rated power due to induced emf in the loop due to earth's magnetic field. Find the mass M (in kg) of the block. (g = 10 ms-2)