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education/physics/PHYS2220/Electric Charge.md
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- $q_1$ and $q_2$ are the charges - $q_1$ and $q_2$ are the charges
- $r$ is the distance between those charges - $r$ is the distance between those charges
- The resulting force will push away if $q_1q_2$ is *positive*, and attract if $q_1q_2$ is negative. This is where the rule "opposites attract, like repels" comes from - The resulting force will push away if $q_1q_2$ is *positive*, and attract if $q_1q_2$ is negative. This is where the rule "opposites attract, like repels" comes from
- Coulomb's law only holds exactly true for *point charges* i.e a proton - Coulomb's law only holds exactly true for *point charges* i.e a proton or electron.
# The Superposition Principle
The superposition principle states that:
> The net charge acting on a point charge is equal to the sum of all individual forces.
This means that to find the net force ac