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education/physics/PHYS2220/Electric Charge.md

@@ -16,4 +16,10 @@
 		- $q_1$ and $q_2$ are the 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
-- 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