Electric generator consists of a circular coil of wire of radius 4.0×10−2 m , with 20 turns. the coil is located between the poles of a permanent magnet in a uniform magnetic field, of magnitude 5.0×10−2 t . the b field is orientated perpendicular to the axis of rotation. the ends of the coil are connected via sliding contacts across a resistor of resistance 1.5 ω. the peak current measured through the resistor is 3.0×10−3 a . part a what is the angular frequency ω at which the coil is rotating