A spherical shell of radius R with a uniform charges 2q has a point charge q at its center the work performed by the electric force during the shell expansion from radius R to radius 2R is

A spherical shell of radius R_(1) with a uniform charge q has a point charge q_0 at its center. Find the work performed by the electric forces during the shell expansion from radius R_(1) to radius R_(2) .

A spherical shell of radius R_(1) with uniform charge q is expanded to a radius R_(2) . Find the work performed by the electric forces in this process.

A sperical shell of radius R with uniform charge q is expanded to a radius 2R. Find the work perfomed by the electric forces and external agent against electric forces in this process.

A spherical shell of radius R has a uniformly distributed charge ,then electric field varies as

A non-conducting spherical shell of radius R surrounds a point charge q (q at center). The electric flux through a cap of the shell of half angle theta is:

A non-conducting spherical shell of radius R surrounds a point charge q (q at center). The electric flux through a cap of the shell of half angle theta is:

A spherical shell of radius R is given charge 3q on its surface and a point charge q is placed at distance R//2 from its centre C . Also there is a charge 2q placed outside the shell at a distance of 2R as shown. Then

A conducting shell of radius R carries charge -Q . A point charge +Q is placed at the centre. The electric field E varies with distance r (from the centre of the shell) as

A metallic spherical shell of radius R has a charge -Q on it. A point charge +Q is placed at the centre of the shell. Which of the graphs shown below may correctly represent the variation of electric field E with distance r from the centre of shell ?