- #1
AdkinsJr
- 150
- 0
Homework Statement
I have a function for an E-field [tex]E(x,y,z,t)=E_o\cos(k(x-ct))\hat j[/tex] and I need to find the charge density...
Homework Equations
[tex]\vec \nabla \cdot\vec E=\frac{\rho}{\epsilon_o}[/tex]
The Attempt at a Solution
When I compute the dot product of gradient operator with the E-field I get zero since the only "term" in the factor is in the y direction, but it also does not have any variation with y so is the charge density in this region of space just zero?