All Problems

Constant Electric Field in a Vacuum

Problem 3.47

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

Reveal Answer
F=3p22πε0l4=2.1⋅10−16 NF=\frac{3 p^{2}}{2 \pi \varepsilon_{0} l^{4}}=2.1 \cdot 10^{-16} \mathrm{~N}
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