Derive an expression for electric potential energy of a system of charges in an electric field.

Derive an expression for potential energy of a system of two charges in an external electric field.

Derive an expression for potential energy of a system of two point charges.

Derive the expression for the potential energy of a system of point charges.

Find the electric potential energy of the system of charges

Derive an expression for a potential energy for a system of N point charges.

Derive an expression for the electric potential energy of a system of two point charges in the absence of an external electric field.

Find the electric potential energy of the system of charges. (a)

Derive an expression for electric potential at a point due to a system of N charges.