The armature of a 4-pole series dc motor has 50 slots, with 10 conductors per slot. There are 4 parallel paths in the armature winding. Every pole of the stator produces a flux of 0. 04 wb. Internal resistance of the motor is 20 ω. The motor is connected to an emf source that provides electrical power at a potential difference of 600 v. The motor runs at a speed of 1500 rpm. The motor has an efficiency of 90%. Calculate the output torque of the motor.