question_answer

A series LCR circuit is tuned to resonance. The impedance of the circuit now is:

A)  \[{{\left[ {{R}^{2}}+{{\left( \omega L-\frac{1}{\omega C} \right)}^{2}} \right]}^{1/2}}\]  

B)  \[{{\left[ {{R}^{2}}+{{(\omega L)}^{2}}+{{\left( \frac{1}{\omega C} \right)}^{2}} \right]}^{1/2}}\]

C)  \[{{\left[ {{R}^{2}}+{{\left( \frac{1}{\omega C}-\omega L \right)}^{2}} \right]}^{1/2}}\]

D)  \[R\]