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An alternating current of frequency ‘f’ is flowing in a circuit containing a resistance R and a choke L in series. The impedance of this circuit is

(1) R + 2πfL

(2) $\sqrt{{R}^{2}+4{\pi }^{2}{f}^{2}{L}^{2}}$

(3) $\sqrt{{R}^{2}+{L}^{2}}$

(4) $\sqrt{{R}^{2}+2\pi fL}$