Figure 22-40 shows a proton (p) on the central axis through a disk with a uniform charge

Chapter 22, Problem 13

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Figure 22-40 shows a proton (p) on the central axis through a disk with a uniform charge density due to excess electrons.The disk is seen from an edge-on view. Three of those electrons are shown: electron ec at the disk center and electrons es at opposite sides of the disk, at radius R from the center. The proton is initially at distance z R 2.00 cm from the disk. At that location, what are the magnitudes of (a) the electric field due to electron ec and (b) the net electric field E due to electrons es? The proton is then moved to z R/10.0. What then are the magnitudes of (c) at the protons location? (e) From (a) and (c) we see that as the proton gets nearer to the disk, the magnitude of Ec: and (d) E:s,net increases, as expected. Why does the magnitude of from the two side electrons decrease, as we see from (b) and (d)?es ec espR RzFigure 22-40 13.