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The power factor of an ac circuit having resistance (R) and inductance (L) connected in series and an angular velocity ω is

(1) $R/\omega L$

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

(3) $\omega L/R$

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