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A coil of inductive reactance 31 Omega ...

A coil of inductive reactance `31 Omega` has a resistance of `8 Omega`. It is placed in series with a condenser of capacitative reactance `25 Omega`. The combination is connected to an a.c. source of 110 volt. The power factor of the circuit is

A

`0.80`

B

`0.33`

C

`0.56`

D

`0.64`

Text Solution

Verified by Experts

The correct Answer is:
A
`cos phi = (R)/(Z) = (8)/(sqrt(8^(2) + (31 - 25)^(2))) = (8)/(10) = 0.8`
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