In a strict
mathematical method, we should let DV®0 and the sum then becomes
an integral; but we omit that discussion here, for simplicity In short,
using Coulomb’s law and the superposition principle, electric field can
be determined for any charge distribution, discrete or continuous or part
discrete and part continuous 1 13  GAUSS’S LAW
As a simple application of the notion of electric flux, let us consider the
total flux through a sphere of radius r, which encloses a point charge q
at its centre