The power factor of $AC$ circuit having resistance $(R)$ and inductance $(L)$ connected in series and an angular velocity $\omega $ is

Question

$R/\omega L$

$R/{\left( {{R^2} + {\omega ^2}{L^2}} \right)^{1/2}}$

$\omega L/R$

$R/{\left( {{R^2} - {\omega ^2}{L^2}} \right)^{1/2}}$

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