The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles but their magnitude depends upon

London dispersion forces operate only over a very short distance. The energy of interaction varies as inversely proportional to distance between two interacting particles to the power of 6. Large or more complex are the molecules, greater is the magnitude of London forces. This is obviously due to the fact that the large electron clouds are easily distorted or polarised. Hence, greater the polarizability of interacting particles. Greater is the magnitude of interaction energy.