Which molecule(s) will experience the London force? Select all that apply. Solution The London force is the weakest intermolecular force. The London dispersion force is a temporary attractive force that results when the atom forms tempory dipole moment as NH3 and H2O have permanent dipole moment so they will not experience London force. where N2 and H2 doesn\'t possess any permanent dipole moment so in N2 and H2 atoms, the tempory dipole moment can be formed so they can experience London force the answer is N2 and H2 .