# Two charged particles held close to each other are released. As they move, the force on each particle increases. Therefore, what must the particles have?

Apr 18, 2017

AS the distance between the charges decreases, the electrostatic force of attraction varies inversely as ${r}^{2}$. However, the force of attraction might be ATTRACTIVE, i.e. unlike charges, or REPULSIVE, i.e. like charges.
This is a direct consequence of $\text{Coulomb's Law}$, an inverse square law.
Because of the proportionality to $\frac{1}{r} ^ 2$, the particles are likely moving towards each other, AND THUS, given $\text{Coulomb's Law}$, the two particles MUST have opposite electric charge.