We have a uniformly charged, non-conducting sphere (charge per volume,ρ, and radius, R). Then a uniformly charged ruler (charge per length,λ, and length, d) is aligned radially almost touching the surface of the sphere. Determine the net force experienced by the ruler.
I think that's all...
The Attempt at a Solution
I drew my gaussian surface like Gaussian surface.jpg
Now I have the electric field of the sphere at its surface
When I place a ruler almost touching the sphere aligned radially I am not sure what to do... The ruler also has an electric field which we could calculate using gauss's law (the shape would be a box?). I know the spheres electric field interacts with the charged ruler...
Any help would be appreciated!