Coulomb's Law: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Coulomb's Law. Understanding the underlying formula is key to arriving at the correct answer below:

From Coulomb's Law, $F = \frac{1}{4\pi\epsilon_0} \frac{q_1 q_2}{r^2}$. Rearranging gives $\epsilon_0 = \frac{q_1 q_2}{4\pi F r^2}$. The unit is $\text{Coulomb}^2/\text{Newton metre}^2$.