Give the expression for electric field intensity at a point due to a discrete and continuous distribution of charges.

Explanation

(i)For a discrete distribution of charges `vecE=(1/(4 pi epsilon_(00)))sum_("all"DeltaV)(rho DeltaV)/(r^(2))hatr`
(ii) For a continuous distributiion of charges `vecE=1/(4pi epsilon_(0))oint(rho)/(r^(2))dV hatr`