A solid conducting sphere of radius $a$ has a net positive charge $2Q$. A conducting spherical shell of inner radius $b$ and outer radius $c$ is concentric with the solid sphere and has a net charge $-Q$. The surface charge density on the inner and outer surfaces of the spherical shell will be

The vehicles carrying inflammable fluids usually have metallic chains touching the ground:

‘Inside a conductor electrostatic field is zero’. Explain.

Two spherical conductors $A$ and $B$ of radii $1\ mm$ and $2\  mm$ are separated by a distance of $5\ cm$ and are uniformly charged. If the spheres are connected by a conducting wire then in equilibrium condition, the ratio of the magnitude of the electric fields at the surfaces of spheres $A$ and $B$ is

Electric potential of earth is taken to be zero because earth is a good

Inside a hollow charged spherical conductor, the potential