Draw electric field lines when two positive charges are near.
The figure shows some of the electric field lines corresponding to an electric field. The figure suggests
How does the electric field lines depend on area ?
Three charges $q_1 = 1\,\mu c, q_2 = 2\,\mu c$ and $q_3 = -3\,\mu c$ and four surfaces $S_1, S_2 ,S_3$ and $S_4$ are shown in figure. The flux emerging through surface $S_2$ in $N-m^2/C$ is
Draw electric field by negative charge.
Obtain Gauss’s law from the flux associated with a sphere of radius $\mathrm{'r'}$ and charge $\mathrm{'q'}$ at centre.