A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage is 3 . If instead C is removed from the circuit, the phase difference is again 3 between current and voltage. The power factor of the circuit is :

1. A. 0.5
2. B. 1.0
3. C. -1.0
4. D. zero

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