Figure a, shows three plastic sheets that are large, parallel, and uniformly charged. Figure b, gives the

Question:

Figure a, shows three plastic sheets that are large, parallel, and uniformly charged. Figure b, gives the component of the net electric field along an x axis through the sheets. The scale of the vertical axis is set by Es = 6.0 x 105 N/C. What is the ratio of the charge density on sheet 3 to that on sheet 2?