A coil of inductive reactance 31 Omega h...

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

0.33

0.56

0.64

`0.80`

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