Intermolecular forces arise from interaction between partial charges, charges, and temporary charges on atoms or ions or molecules.
Work Step by Step
We know from Coulomb's law that electrons and protons are attracted to each other because their potential energy decreases when they get closer. In the same way, molecules having temporary or partial charges are attracted to each other because their potential energy also decreases as they get closer. This is the cause of intermolecular forces.