cohesive force

You mean inversely proportional to the square of the distance, yes?

I don't feel as though I adequately grasp what you are asking. Perhaps this link may guide your thoughts: http://hyperphysics.phy-astr.gsu.edu/hbase/forces/funfor.html

Thanks for response and sending me links.I know that gravitational,electric and magnetic force all follows inverse square law.So i simply assume that cohesive force also follows a inverse square law as it was mainly originated by the cause of electrostatic and magnetic force between molecules.But in the nature,there is also presence of force which never follows a inverse square law like nuclear force and weak forces.Can I say that;
cohesive force = 1/(intermolecular separation)^n where n>0
because we know that the electrostatic and magnetic interaction between molecules increases as separation between them decreases.