Gauss's law and Coulomb's law , although expressed in different forms , are equivalent ways of describing the relation between charge and electric field in static conditions . Gauss's law is `epsilon_(0) phi = q_(encl)`,when `q(encl)` is the net charge inside an imaginary closed surface called Gaussian surface. The two equations hold only when the net charge is in vaccum or air .
The net flux of the electric field through the surface is

Options

A. due to `q_(1)` and `q_(2)` only
B. due to `q_(3)` and `q_(4)` only
C. equal due to all the four charges
D. cannot say

Answer

A

Explanation

Net flux depends on charge change enclosed , i.e., due to `q_(1)` and `q_(2)` only. Net flux depends on charge.