Electric Potential due to a Point Charge, a Dipole and a System of Charges

Having defined potential in general, this section derives its explicit formula for three progressively richer source configurations: a single point charge (section 8.4.1), an electric dipole (section 8.4.2), and finally a general system of many point charges (section 8.4.3) -- each building directly on the previous one, since a dipole …