Class 12 Physics Electromagnetic Induction Application of EMI (DC Motor)

Medium

The back emf in a $DC$ motor is maximum when,

MHT CET 2012 All MHT CET

A
the motor has picked up maximum speed
B
the motor has just started moving
C
the speed of motor is still on increase
D
the motor has just been switched off

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Class 12 Questions

Class 12

Physics Questions

Chapter

Electromagnetic Induction

Subtopic

Application of EMI (DC Motor)

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Assertion : An electric motor will have maximum efficiency when back $emf$ becomes equal to half of applied $emf$.
Reason : Efficiency of electric motor depends only on magnitude of back $emf$.

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