If $R$ and $L$ represent respectively resistance and self inductance, which of the following combinations has the dimensions of frequency

  • A

    $\frac{R}{L}$

  • B

    $\frac{L}{R}$

  • C

    $\sqrt {\frac{R}{L}} $

  • D

    $\sqrt {\frac{L}{R}} $

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  • [AIPMT 1999]