The dependence of electrostatic force on separation between two point charges is best described as
A$F \propto r$
B$F \propto r^2$
C$F \propto \dfrac{1}{r}$
D$F \propto \dfrac{1}{r^2}$
Answer & Solution
Correct answer: D. $F \propto \dfrac{1}{r^2}$
Coulomb's law states that the electrostatic force varies inversely as the square of the distance between the charges. Hence $F \propto \dfrac{1}{r^2}$.
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