A circular shaft AB consists of a 250 mm long, 22 mm diameter steel cylinder which is 125 mm long and a 16mm diameter cavity has been drilled from the other end B. The shaft is attached to fixed supports at both ends and a 120 N-m torque is applied at its mid- section. a) Determine the torque exerted on the shaft at A. b) Determine the torque exerted on the shaft at B. 125 mm 125 mm A 120 N.m B