From 29d1938c41448ba5b193b418a86d052c274995f4 Mon Sep 17 00:00:00 2001 From: arc Date: Tue, 6 Jan 2026 07:33:06 -0700 Subject: [PATCH] vault backup: 2026-01-06 07:33:06 --- education/physics/PHYS2220/Electric Charge.md | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/education/physics/PHYS2220/Electric Charge.md b/education/physics/PHYS2220/Electric Charge.md index e69de29..845b80e 100644 --- a/education/physics/PHYS2220/Electric Charge.md +++ b/education/physics/PHYS2220/Electric Charge.md @@ -0,0 +1,16 @@ +# Electric Charge +- Charges come in two varieties, positive and negative. +- Net charge is the *algebraic sum* of an object's charges +- Protons and electrons have the same magnitude of charge ($1e$) + - The SI Unit of charge is the *Coulomb* (abbreviated C) + - The smallest discrete quantity of charge is $\frac{1}{3}e$. +- In an isolated system, the net charge will always remain constant. + +# Electric Force +- Two charges will exert a force on each other along the line joining them. + - The magnitude of this force is proportional to the *product of the charges* and inversely proportional to the to the $\sqrt{dist}$. + - The equation to determine the force between two charges is as follows: + $$ \vec{F_{12} = \vec{r}k\frac{q_1q_2}{r^2}} $$ + - $\vec{r}$ is a unit vector pointing from charge 1 to charge 2 + - $k$ is Couloumb's constant, or $8.99 * 10^9 \frac{Nm^2}{C^2}$ + - $q_1$ and $q_2$ \ No newline at end of file