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In an LR series circuit with ac source the average power from the souce gets halved if the frequency

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In an LR series circuit with ac source the average power from the souce gets halved if the frequency of the source is changed from f to 2f. The power factor of the circuit at frequency f is:

( A) 1 

(B) 1/2 

(C) 1/√2 

(D) 0

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1 Answer

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Best answer

Correct option (C) 1/√2 

Explanation:

P will be halved if Z2 is doubled.Since frequency is doubled XL will also be doubled. 

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