The resonant frequency of an $L-C$ circuit is

  • A
    $\frac{1}{2 \pi \sqrt{L C}}$
  • B
    $\frac{1}{2 \pi} \sqrt{\frac{L}{C}}$
  • C
    $\frac{1}{2 \pi} \sqrt{\frac{C}{L}}$
  • D
    $\frac{1}{\sqrt{L C}}$

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