A.\(U = \sqrt {2\left[ {{u^2} + {i^2}{{\left( {\omega L - \frac{1}{{\omega C}}} \right)}^2}} \right]} \)
B.\(U = \sqrt {\frac{1}{2}\left[ {{u^2} + {i^2}{{\left( {\omega L - \frac{1}{{\omega C}}} \right)}^2}} \right]} \)
C.\(U = \sqrt {{u^2} + {i^2}{{\left( {\omega L - \frac{1}{{\omega C}}} \right)}^2}} \)  
D.\(U = \sqrt {{u^2} + 2{i^2}{{\left( {\omega L - \frac{1}{{\omega C}}} \right)}^2}} \)

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