In Vander Waals equation $\left[ P +\frac{ a }{ V ^{2}}\right][ V - b ]= RT$; $P$ is pressure, $V$ is volume, $R$ is universal gas constant and $T$ is temperature. The ratio of constants $\frac{a}{b}$ is dimensionally equal to .................

  • [JEE MAIN 2022]
  • A

    $\frac{P}{V}$

  • B

    $\frac{ V }{ P }$

  • C

    $PV$

  • D

    $PV ^{3}$

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