A separately excited DC motor runs at 1500 rpm under no-load with 200 V applied to the armature. The field voltage is maintained at its rated value. The speed of the motor, when it delivers a torque of 5 Nm, is 1400 rpm as shown in figure. The rotational losses and armature reaction are neglected. Speed (rpm) 1500 1400 0 5 torque(Nm) For the motor to deliver a torque of 2.5 Nm at 1400 rpm, the armature voltage to be applied is (A) 125.5 V (C) 200 V (B) 193.3 V (D) 241.7 V