given the sketchy bellow of a simple electric motor a copper disk radius of r=5.00x10^-3 metres is mounted on a shaft that rests on bearings electrical contact is made through sliding brushes at a and b and current I=5.00x10^-3A passes through the circuit a magnetic field of B=9.00x10^-2T is directed into the page a) compute the torque exerted by the motor on its load?

X X X Shaft B X X > a