The rod shown carries a charge per unit length $={}_{0}x,$ where $x=0$ is at the

left end of the rod. What is the electric field at the point P$?$We have two infinite plane sheets of charge, with charge density

$=6\frac{C}{m^2}$ and $=-6\frac{C}{m^2}$

A$.$ If the two planes are parallel, $0\mathrm{.}10m$ apart, find the electric field in each of

the three regions $($above both planes, between the planes, and below both

planes$).$

B$.$ If the two planes intersect at right angles, find the electric field in each of

the four regions.

C$.$ Repeat part a if the charge densities of the two planes are $=6\frac{C}{m^2}$

and $=-4\frac{C}{m^2}$