# How exactly do you find the net force between charges?

by paki123
Tags: charges, force
 PF Gold P: 936 Yes and Yes! If $\textbf{F}_{i, j}$ means the force that charged particle j exerts on charged particle i, then $\textbf{F}_{i, j}$ = $\textbf{F}_{j, i}$. In other words the forces between the particles are equal and opposite. For three particles, the force on particle 1 is $\textbf{F}_{1, 2}$ + $\textbf{F}_{1, 3}$ the force on particle 2 is $\textbf{F}_{2, 3}$ + $\textbf{F}_{2, 1}$ the force on particle 3 is $\textbf{F}_{3, 1}$ + $\textbf{F}_{3, 2}$ So the net force, that is the forces on all three particles added together, is zero, because $\textbf{F}_{1, 2}$ = $-\textbf{F}_{2, 1}$ and so on.