In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will

Q. In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will

A.            remain unchanged

B.            reduce to one-fourth value

C.            increase four folds

D.            be doubled

Answer: remain unchanged