Draw the electric field lines for a positive point charge.

Total electric flux coming out of a unit positive charge placed in air is

The $S.I.$ unit of electric flux is

$A$ hemispherical surface of radius $a$ is placed in a uniform electric field $E$ such that the flat surface makes an angle of $\pi /4$ with the vertical. There is no charge inside the hemisphere. The electric flux passing through the curved surface of the hemisphere is:

If the radius of the spherical Gaussian surface is increased,then the electric flux due to a point charge enclosed by the surface:

How does the number of electric field lines depend on the area?