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education/physics/PHYS2220/Electric Charge.md
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# Electric Charge # Electric Charge
- Charges come in two varieties, positive and negative. - Charges come in two varieties, positive and negative.
- Net charge is the *algebraic sum* of an object's charges - Net charge is the *algebraic sum* of an object's charges
- Protons and electrons have the same magnitude of charge ($1e$) - Protons and electrons have the same magnitude of charge (designated $1e$; a unit, **not** Euler's number)
- The SI Unit of charge is the *Coulomb* (abbreviated C) - The SI Unit of charge is the *Coulomb* (abbreviated C)
- The smallest discrete quantity of charge is $\frac{1}{3}e$. - The smallest discrete quantity of charge is $\frac{1}{3}e$.
- In an isolated system, the net charge will always remain constant. - In an isolated system, the net charge will always remain constant.
@@ -20,6 +20,6 @@
# The Superposition Principle # The Superposition Principle
The superposition principle states that: The superposition principle states that:
> The net charge acting on a point charge is equal to the sum of all individual forces. > The net force acting on a point charge is equal to the sum of all individual forces.
This means that to find the net force ac This means that to find the net force acting on a single charge, you add up all of the individual forces acting on that charge.