Determine the potential at a distance r from a point charge +q. How can the potential at a point be determined due to a number of point charges?

Determine the electric field at a distance r from a point charge.

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

Define electric potential. Determine the electric potential at a distance r from a point charge q placed in vacuum. What would be the change in the potential if the charge is placed in a medium of dielectric constant k?

The Potential due to a single point charge falls as