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A series LCR circuit is connected to an ...

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 `(pi)/(3)`.If instead `C` is removed from the circuit, the phase difference is again `(pi)/(3)` between current and voltage. The power factor of the circuit is :
(1) `-1.0`
(2) `zero`
(3) `0.5`
(4) `1.0`

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