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## Homework Statement

A rod of length 2L has a charge -Q uniformly distributed over its left half and +Q uniformly distributed over its right half. Find E at point p a distance z above the center of the rod.

## Homework Equations

E= 1/(4pi[itex]\epsilon[/itex][itex]_{0}[/itex])∫dq/r([itex]\hat{r}[/itex])

dq=λdl

where [itex]\epsilon[/itex][itex]_{0}[/itex]= 8.854 x 10

^{-12}C

^{2}/Nm

^{2}

and λ=charge per unit length

## The Attempt at a Solution

I'm not even sure where to start exactly. I know the length from the rod to p at any given point will be √(L

^{2}+z

^{2}) but I'm really not sure where to go from here. I missed a couple of class periods due to being sick and I've been trying to play catch up ever since so any help would be greatly appreciated!