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 :

1. A

R

2. B

$\mathrm{R}+2\mathrm{\pi fL}$

3. C

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

4. D

$\mathrm{R}/2\mathrm{\pi fL}$

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