1.

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 [CPMT 1978; MP PMT 1993; MP PET 1999; AIIMS 2000; Pb. PET 2004; RPET 2001, 03]

A.            R + 2pfL
B.            \[\sqrt{{{R}^{2}}+4{{\pi }^{2}}{{f}^{2}}{{L}^{2}}}\]
C.            \[\sqrt{{{R}^{2}}+{{L}^{2}}}\]
D.            \[\sqrt{{{R}^{2}}+2\pi fL}\]
Answer» C.            \[\sqrt{{{R}^{2}}+{{L}^{2}}}\]


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