A charge $q$ is located at the centre of a cube. The electric flux through any face is
$\frac{{4\pi q}}{{6(4\pi {\varepsilon _0})}}$
$\frac{{\pi q}}{{6(4\pi {\varepsilon _0})}}$
$\frac{q}{{6(4\pi {\varepsilon _0})}}$
$\frac{{2\pi q}}{{6(4\pi {\varepsilon _0})}}$
Write $SI$ unit of electric flux.
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
If the electric field intensity in a fair weather atmosphere is $100 \,V / m$, then the total charge on the earth's surface is ............ $C$ (radius of the earth is $6400\,km$ )
If a charge $q$ is placed at the centre of a closed hemispherical non-conducting surface, the total flux passing through the flat surface would be
A positive charge $q$ is kept at the center of a thick shell of inner radius $R_1$ and outer radius $R_2$ which is made up of conducting material. If $\phi_1$ is flux through closed gaussian surface $S_1$ whose radius is just less than $R_1$ and $\phi_2$ is flux through closed gaussian surface $S_2$ whose radius is just greater than $R_1$ then:-