A 220 volt dc series motor is running at a speed of 800 rpm and draws 100 amperes. Calculate at what speed the motor will run when developing half the torque. Total resistance of the armature and field is 0.1 ohm.

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A 220 volt dc series motor is running at a speed of 800 rpm and draws 100 amperes.
Calculate at what speed the motor will run when developing half the torque. Total
resistance of the armature and field is 0.1 ohm.

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