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A dipole-dipole force is between molecules that are always polar. An induced dipole-induced dipole force is between molecules that have instantaneous dipole moments; the electrons move around, making the molecule temporarily polar.
Dipole-dipole interactions occur when the positively charged part of a molecule interacts with the negatively charged part of another molecule. Induced dipole-induced dipole exists between all types of molecules (polar or nonpolar). Electrons constantly move so an atom or molecule can develop a temporary (instantaneous) dipole when its electrons are distributed unevenly around the nucleus. A second atom or molecule then can be attracted to the appearance of the dipole in the first atom or molecule.
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