# Jefimenko's equations

Tags:
1. Jan 3, 2015

2. Jan 3, 2015

### ShayanJ

That means a volume element. In Cartesian coordinates its $dx' \ dy' \ dz'$, in spherical coordinates $r'^2 \ \sin\theta' \ dr' \ d\varphi \ d\theta$ and in cylindrical coordinates $\rho \ d\rho' \ d\varphi' \ dz'$.