From a7b8585374b3cef7d4be0e57d89d5f406db3e3dd Mon Sep 17 00:00:00 2001 From: eggy Date: Tue, 9 Feb 2021 20:28:12 -0500 Subject: [PATCH] phys: correct coulomb constant unit --- docs/sph3u7.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/sph3u7.md b/docs/sph3u7.md index cce7ab1..476609a 100644 --- a/docs/sph3u7.md +++ b/docs/sph3u7.md @@ -873,7 +873,7 @@ Charges are expressed in **Coulombs** ($\text{C}$) with the symbol $q$. One elec Similar to gravitation, the forces between charges is proportional to their charges and inversely proportional to the square of the distance between them. $$F_E \propto q_1q_2 \propto \frac{1}{r^2}$$ -The equation that describes the force between charges is as follows, where $k$ is a constant with the value $8.99×10^9\text{ m}^{-2}\text{C}^{-2}$: +The equation that describes the force between charges is as follows, where $k$ is a constant with the value $8.99×10^9\text{ N m}^{2}\text{C}^{-2}$: $$F_E = \frac{kq_1q_2}{r^2}$$ The **electrical permittivity**, $\epsilon$, of a material is its resistance in creating an electric field in it, and has the units $\text{farad}\cdot\text{m}^{-1}$. Free space/a vaccum has a permittivity of $1$ and its value is known as $\epsilon_0$.