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An alternating current of frequency ' \( f \) ' is flowing in a
P circuit containing a resistance \( \mathrm{R} \) and a choke \( \mathrm{L} \) in

W series. The impedance of this circuit is
(1) \( R+2 \pi f L \)
(2) \( \sqrt{R^{2}+4 \pi^{2} f^{2} L^{2}} \)
(3) \( \sqrt{R^{2}+L^{2}} \)
(4) \( \sqrt{R^{2}+2 \pi f L} \)
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