Determine Electric Field At Origin

[lufbra08]

Homework Statement

A line of uniform charge starts at x=+X0 and extends to positive infinity with uniform linear charge density U. Determine the electric field at the origin.

Homework Equations

E=kQ/r^2

The Attempt at a Solution

dQ=Udr

E=kU int(from x0 to infinity)dr/r^2

E=kU/x0

Sorry the equations are a bit tricky to read but I just need to check that I have understood the problem correctly. Any help appreciated :) Thanks guys

 

[JaWiB]

You don't seem to have taken into account the direction of the electric field due to the infinitesimal charges.