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 \( P_2 \). Then ratio \( \dfrac{P_1}{P_2} \) is:
\( \dfrac{1}{2} \)
\( \dfrac{1}{\sqrt{2}} \)
\( \dfrac{\sqrt{3}}{\sqrt{2}} \)
\( 2:1 \)
