Derive an expression for the potential at a distance r from a point charge `+q`.

Derive an expression for potential due to a dipole at any point.

Derive an expression for the potential at a point along the axial line of a short electric dipole.

The electric potential at a point at a distance of 2m from a point charge of 0.1mu C is 450V. The electric field at this point will be….N/C.

A spherical conducting shell if inner radius R_(1) and outer radius R_(2) has a charge Q. A charge q is placed at the centre of the shell. Write an expression for the electric field at a point XgtR_(2) from the centre of the shell.

Electric field intensity is |vecE| at a distance r from an isolated point charge. Then