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In a series LR circuit X L = R and power factor of the circuit is P 1 . When capacitor with capacitance C such that X L = X C is put in series, the power factor becomes P 2 . The ratio 2 1 P P is

1. 2 1
2. 2 1
3. 2 3
4. 2 : 1

Correct answer: 2 1

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