If flux is increased by 50% & speed is reduced by 50% of a d.c. motor, then its back emf will become 0.75 % of original back emf

Q.  If the flux is increased by 50% and speed is reduced by 50% of a d.c. motor (keeping the other parameters constant), then its back emf will become
- Published on 23 Oct 15

a. 50 % of the original back emf
b. 0.75 % of the original back emf
c. 100 % of the original back emf
d. 150 % of the original back emf

ANSWER: 0.75 % of the original back emf

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