In part (a) of the figure an electron is shot directly away from a uniformly charged plastic sheet, at speed vs = 2.00 x 105 m/s. The sheet s nonconducting, flat, and very large. Part (b) of the figure gives the electron's vertical velocity component vversus time t until the return to the launch point. What is the sheet's surface charge density? Assume ts = 20.0 ps. v (103 m/s) -V. (ps) (a) (b) Number i UnitsA charge of uniform linear density 2.40 nC/m is distributed along a long, thin, nonconducting rod. The rod is coaxial with a long conducting cylindrical shell (inner radius = 5.60 cm, outer radius = 9.40 cm). The net charge on the shell is zero. (a) What is the magnitude of the electric field at distance r = 15.0 cm from the axis of the shell? What is the surface charge density on the (b) inner and (c) outer surface of the shell? (a) Number i Units (b) Number i Units (c) Number i Units 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 = 3.6 x 105 N/C. What is the ratio of the charge density on sheet 3 to that on sheet 2? (a) E (10' N/C) (b) Number i Units