At the end of this lesson you should be able to:

• Know the relationship between permittivity of free space and Coulombs constant.
• Know the charge distribution and electric fields associated with conductors in electrostatic equilibrium.
• Know the definitions of electric potential and electric potential energy.
• Distinguish between electric potential, electric potential energy and electric potential difference
• Know the relationship between electric isopotential surfaces and electric field lines.
• Determine the magnitude of the electric potential at a point a known distance from a point charge.
• State the relationship between electric potential energy and electric field and the potential difference between two points a fixed distance apart in a region where the electric field is uniform.
• To state the relationship between charge on a capacitors plates, the potential difference between the plates and capacitance of the capictor.
• To know the expression for the energy density at a point in an electric field.
• Understand how a dielectric increases the amount of energy that can be stored in the electric field between a capacitors plates.