A metallic solid sphere is placed in a uniform electric field. The lines of force follow the path(s) shown in figure as
$1$
$2$
$3$
$4$
A point charge $ + q$ is placed at the centre of a cube of side $L$. The electric flux emerging from the cube is
The black shapes in the figure below are closed surfaces. The electric field lines are in red. For which case, the net flux through the surfaces is non-zero?
What is called Gaussian surface ?
Gauss's law can help in easy calculation of electric field due to
The flat base of a hemisphere of radius $a$ with no charge inside it lies in a horizontal plane. A uniform electric field $\vec E$ is applied at an angle $\frac {\pi }{4}$ with the vertical direction. The electric flux through the curved surface of the hemisphere is