From the following combinations of physical constants (expressed through their usual symbols) the only combination, that would have the same value in different systems of units, is :

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The ratio of electric and gravitational forces is dimensionless

$\frac{F _{e}}{F _{g}} = \frac{e ^{2}}{4 π ε _{0} G m _{e}^{2}}$

Option 3 is twice this ratio A dimensionless combination keeps its numerical value across coherent unit systems

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