Gauss’s law is true only if force due to a charge varies as
${r^{ - 1}}$
${r^{ - 2}}$
${r^{ - 3}}$
${r^{ - 4}}$
Assertion : Electric lines of force never cross each other.
Reason : Electric field at a point superimpose to give one resultant electric field.
As shown in figure, a cuboid lies in a region with electric field $E=2 x^2 \hat{i}-4 y \hat{j}+6 \hat{k} \quad N / C$. The magnitude of charge within the cuboid is $n \varepsilon_0 C$. The value of $n$ is $............$ (if dimension of cuboid is $1 \times 2 \times 3 \;m ^3$ )
If an electric field is given by $10 \hat{i}+3 \hat{j}+4 \hat{k}$, calculate the electric flux through a surface of area $10$ units lying in $y z$ plane ....... units
The electric field in a certain region is acting radially outward and is given by $E =Ar.$ A charge contained in a sphere of radius $'a'$ centred at the origin of the field, will be given by
The figure shows some of the electric field lines corresponding to an electric field. The figure suggests