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$A$ resistor of resistance $R$, an inductor of inductive reactance $2R$, and a capacitor of capacitive reactance $X_C$ are connected in series to an $A.C.$ source. If the series $LCR$ circuit is in resonance, then the power factor of the circuit and the value $X_C$ are respectively:
- A$0.5$ and $4R$
- B$1$ and $2R$
- C$0.5$ and $2R$
- D$1$ and $4R$
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