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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 becomes

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a

111

b

17

c

13

d

15

answer is B.

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Detailed Solution

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cosϕ=RZ=RR2+L2ω2

12=R2R2+XL2       XL=R

cosϕ'=RR2+(2XL)2=R5R2=15

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