The impedance of a series RLC circuit is
A. $$\sqrt {{R^2} + X_L^2 + X_C^2} $$
B. $$\sqrt {{R^2} + X_L^2 - X_C^2} $$
C. $$\sqrt {{R^2} + {{\left( {{X_L} + {X_C}} \right)}^2}} $$
D. $$\sqrt {{R^2} + {{\left( {{X_L} - {X_C}} \right)}^2}} $$
Answer: Option D

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