AC circuit

A resistance ( R ) (R) , inductance ( L ) (L) and capacitance ( C ) (C) are connected in series to an ac source of voltage V V having variable frequency. If the energy delivered by the source to the circuit during one period if the operating frequency is twice the resonance frequency is E = π R L C V 2 R 2 + x ( L C ) E=\frac{πR\sqrt{LC}V^{2}}{R^{2}+x\left(\frac{L}{C}\right)}
Find x x .


The answer is 2.25.

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