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Q.

The power factor of a series RL circuit is 12 . If the frequency of the applied ac is doubled, the power factor become.

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a

13

b

15

c

17

d

111

answer is B.

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Detailed Solution

cosϕ=RZ=RR2+L2ω212=R2R2+Xc2  Xc=Rcosϕ1=RR2+(2Xc)2=R5R2
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