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 sperical shell of radius R_(1) with a unifrom charge q has a point charge q_(0) at the its centre . Find the work perfomed by the electric forces during the shell expansion form radius R_(1) to radius R_(2) .

A spherical shell of radius r with a uniform charge q has point charge q_(0) at its centre. Find the work performed by the electric forces during the shell expansion slowly from radius R to 2R. Also find out work done by external agent against electric forces.

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 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 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 b with charge Q is expanded to a radius a. Find the work done by the electrical forces in the process.