arc/notes
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

vault backup: 2026-01-06 08:12:37

Browse Source
This commit is contained in:
arc
2026-01-06 08:12:37 -07:00
parent acdb28e03f
commit 58b64b7176
1 changed files with 3 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
education/physics/PHYS2220/Electric Charge.md
View File

@@ -30,3 +30,6 @@ An electric dipole consists of two point charges of equal magnitude but opposite
- The dipole field at large distances decreases as the inverse *cube* of the distance. This is because the dipole has zero *net* charge. - The dipole field at large distances decreases as the inverse *cube* of the distance. This is because the dipole has zero *net* charge.
# Continuous Charge Distributions # Continuous Charge Distributions
It's largely impossible to sum the electric field from every particle in a piece of matter, so the approximation is made that the charge is spread continuously over the distribution.
- If the charge distribution extends throughout a 3d volume, we describe it in terms of the **volume charge density** $\rho$, with units of $\frac{C}{m^3}$.
- For charge distributions spread over surf