An alternating current of frequency f is flowing in a circuit containing a resistance R and a choke L in series . The impedance of the circuit is equal to :

An alternating current of frequency f is flowing in a circuit containing a resistance R and a choke L in series . The impedance of the circuit is equal to :

A
R
B
$R + 2 πfL$
C
$\sqrt{(R^{2} + 4 π^{2} f^{2} L^{2})}$
D
$R / 2 πfL$

Solution:

$Z = \sqrt{R^{2} + 4 π^{2} f^{2} L^{2}}$

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