If $L,\,C$ and $R$ represent inductance, capacitance and resistance respectively, then which of the following does not represent dimensions of frequency

  • [IIT 1984]
  • A

    $\frac{1}{{RC}}$

  • B

    $\frac{R}{L}$

  • C

    $\frac{1}{{\sqrt {LC} }}$

  • D

    $\frac{C}{L}$

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