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Let $[\in_0]$ denote the dimensional formula of the permittivity of vacuum. If M = mass, L = length, T = Time and A = electric current, then:

$\begin{array}{1 1} (1)\;[ \in_0]=[ M^{-1}L^{-3}T^2A] \\ (2)\;[ \in_0 ]=[ M^{-1}L^{-3}T^{4}A^{-2}] \\ (3)\;[ \in_0 ]=[ M^{-1}L^{2}T^{-1}A^{-2}] \\ (4)\;[ \in]=[ M^{-1}L^{2}T^{-1}A ] \end {array}$

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