The figure below shows two lines of charge in cross-section coming out of the page. Each line of charge has a linear charge density of 7.90 nC/cm and they are separated by a distance d = 20.8 cm. What is the magnitude of the electric field at the dot, a point y = 5.70 cm above the midpoint between the lines? Electric field magnitude: ◻
![A pair of infinite parallel planes are separated by a distance d, with one above the other. The top plane has a uniform charge density σ. The bottom plane has a uniform charge density −σ. a. Determine the electric field everywhere. [Note that there is no slab between the planes for part a.] b. An infinite conducting slab is placed between the two planes with top and bottom faces parallel to the two planes and without touching the two planes. Determine the induced charge densities on the top and bottom of the conducting slab.](https://www.doubtrix.com/uploads/editor/1488101134cGuSVvKwzy.png)