In a DNA molecule a weak hydrogen bond dipoles can be formed between two electric dipoles, for example between cytosine and guanine. In the picture is represented cytosine's dipole molecule C⁺ = O^-(electric dipole moment is p1 = 8.0 x 10^-30Cm) and guanine's dipole molecule (p₂ = 3.0 x 10^-30Cm) and their locations in respect to each other.

How large is the binding energy of the hydrogen bond?

Electric dipole moment