In the circuit shown in Figure 18.91, all of the wire is made of Nichrome, but one segment has a much smaller cross-sectional area. On a copy of this diagram, using the same scale for magnitude that you used in the previous question for Figure 18.90, show the steady-state electric field at the locations indicated, including in the thinner segment. Before attempting to answer these questions, draw a copy of this diagram. All of the locations indicated by letters are inside the wire.
(a)On your diagram, show the electric field at the locations indicated, paying attention to relative magnitude. Use the same scale for magnitude as you did in the previous question.
(b)Carefully draw pluses and minuses on your diagram to show the approximate surface charge distribution that produces the electric field you drew. Make your drawing show clearly the differences between regions of high surface charge density and regions of low surface-charge density. Use your diagram to determine which of the following statements about this circuit are true.
(1) There is a large gradient of surface charge on the wire between locations Cand E. (2) The electron current is the same at every location in this circuit.
(3) Fewer electrons per second pass location Ethan location C.
(4) The magnitude of the electric field at location Gis smaller in this circuit than it
was in the previous circuit (Figure 18.90).
(5) The magnitude of the electric field is the same at every location in this circuit.
(6) The magnitude of the electric field at location D is larger than the magnitude of the electric field at location G.
(7) There is no surface charge at all on the wire near location G.
(8) The electron current in this circuit is less than the electron current in the previous circuit (Figure 18.90).
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