Short Explanations- Electrostatics

Coulombs law is Inverse square law

Since force is a vector the principle of superposition involves vector addition

Electric field is actually the stress experienced on the point by an electric charge, it is the force experienced on a unit positive charge placed at that point. F=qE
Unit of electric field is N/C

Electric field is known by other terms such as flux density and intensity of electric field it also have an inverse square relation with distance 

Electric field lines never passes through a metal so inside the conductor the electric field E=0

Electric field can be considered as the negative potential gradient E=-dV/dr

By Gauss theorem E.A=q/epsilon not there fore E=q /A X epsilon not

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