Problem 3.47

Find the interaction force between two water molecules separated by a distance \(l=10 \mathrm{nm}\) if their electric moments are oriented along the same straight line. The moment of each molecule equals \(p=0.62 \cdot 10^{-29} \mathrm{C} \cdot \mathrm{m}\)

F=\frac{3 p^{2}}{2 \pi \varepsilon_{0} l^{4}}=2.1 \cdot 10^{-16} \mathrm{~N}

Constant Electric Field in a Vacuum