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When the armature of a DC motor rotates, emf induced is in machine is called as ___________

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When the armature of a DC motor rotates, emf induced is in machine is called as ___________

(a) Self-induced emf

(b) Mutually induced emf

(c) Back emf

(d) Cannot be determined

I had been asked this question in quiz.

The above asked question is from Speed Control Using Armature Control in DC Motor topic in division DC Motors of DC Machines

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Right option is (c) Back emf

For explanation I would say: According to terminology used in DC machines, emf induced in a machine when armature rotates is called as back emf. This back emf value is directly proportional to the speed of the motor.

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