The torque produced by a DC motor armature is the multiplication product of two factors, one being the density of the magnetic flux which is dependent upon the field current. What is the other multiplication factor?

Correct Answer: Option D — armature current

Electromagnetic torque developed in a DC motor armature is defined mathematically by the fundamental torque equation: Torque is directly proportional to the product of magnetic flux density (established by field current) and armature current. Controlling either parameter directly modulates the motor's mechanical output torque.