Linked from
The 15 pages that link to Coulomb potential, each with the reason it gives.
Coulomb's lawBroader topic: It is the energy-based form of the same pair interaction.
Hydrogen atomRelated: It describes the attraction that binds the electron to the proton.
PhotoionizationRelated: It describes the attraction binding an electron to the residual ion.
Exotic atomNarrower topic: It supplies the principal binding force in many exotic atoms.