In $SI\, units$, the dimensions of $\sqrt {\frac{{{ \varepsilon _0}}}{{{\mu _0}}}} $ is

  • [JEE MAIN 2019]
  • A

    $A{T^{ - 3}}M{L^{3/2}}$

  • B

    ${A^{ - 1}}TM{L^3}$

  • C

    ${A^2}{T^3}{M^{ - 1}}{L^{ - 2}}$

  • D

    $A{T^2}{M^{ - 1}}{L^{ - 1}}$

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  • [JEE MAIN 2019]