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Q.

A coil of inductive reactance 31 ohm has a resistance of 8 ohm. It is placed in series with a condenser of capacitive reactance 25 ohm. The combination is connected to an ac source of 110 V. The power factor of the circuit is :

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a

0.56

b

0.64

c

0.80

d

0.33

answer is D.

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Detailed Solution

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Power factor = cosϕ=RZ=882+31-252

                   =882+62=810=0.8

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