If back emf of a d.c. motor is doubled & flux is halved then its speed will become four times of original speed

Q.  If the back emf of a d.c. motor is doubled and flux is halved (keeping other parameters constant) then its speed will become
- Published on 23 Oct 15

a. Double of the original speed
b. Square of the original speed
c. Four times of the original speed
d. Half of the original speed

ANSWER: Four times of the original speed

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