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2) I recently read in a Quora post that the Electrostatic force in Gaussian CGS units is just ##\dfrac{q_1q_2}{r^2}## ,whole converting to SI units we get a factor of ##ε_0## for free space ,now does that mean in CGS units the flux is just around a charge is just Q( here the net charge is Q) because in SI units our formula becomes ##\dfrac{Q}{ε_0}## ,What I am meaning to say is I don't the whole concept of multiplying E field vecotr and infinitesimal area to get the infinitesimal flux for that infinitesimal area ,multiplying by dA reduces our E field value ,does this mean our E field vector is per unit area (if dA =0.0000001,then when multiplied with E.##\vec{n}## this term becomes small ) does this mean our E field vector is defined per unit area

.https://www.quora.com/What-is-an-intuitive-explanation-of-the-Vacuum-permittivity/answer/Thomas-Jollans?ch=10&oid=5917841&share=6d7771dd&srid=pGwHF&target_type=answer