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

Gauss's law is true only if the force due to a charge varies as:

$A$ 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:

Select the correct statement regarding electric field lines.

Which of the following is a correct statement?

$A$ point charge '$Q$' is placed at a point inside a hollow conducting sphere. Which of the following electric field patterns is correct?