Which principle is used to get the required phase difference in induction type wattmeter?

Q.  In induction type wattmeter both current and pressure coils are required. For obtaining the required phase difference
- Published on 14 Sep 15

a. Shaded pole principle is used
b. Two separate ac magnets are used
c. Only one ac magnets are used
d. All of these

ANSWER: Two separate ac magnets are used

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