In terms of resistance $R$ and time $T$, the dimensions of ratio $\frac{\mu } {\varepsilon }$ of the permeability $\mu $ and permittivity $\varepsilon $  is

  • [JEE MAIN 2014]
  • A
    $\left[ {R{T^{ - 2}}} \right]$
  • B
    $\left[ {{R^2}{T^{ - 1}}} \right]$
  • C
    $\left[ {{R^2}} \right]$
  • D
    $\left[ {{R^2}{T^2}} \right]$

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