# Inverse Square Law

This question came up in my textbook : Describe an example of a force you have experienced that follows the inverse square law. I couldn't think of any that I have "experienced", since I don't think that I have "experienced" the force of gravity that shows it is a inverse relationship.

$$\vec{F}_{21}=k\frac{Q_{1}Q_{2}}{r^2} \hat{r}_{21}$$