In the circuit shown in Figure 19.76, all of the wire is made of Nichrome, but one segment has a much smaller crosssectional area.
On a copy of this diagram, using the same scale for magnitude that you used in the previous question for Figure 19.75,
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
surfacecharge 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 C and E.
(2) The electron current is the same at every location in this circuit.
(3) Fewer electrons per second pass location E than location C.
(4) The magnitude of the electric field at location G is smaller in this circuit than it was in the previous circuit
(Figure 19.75).
(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. The electron current in this circuit is less than
the electron current in the previous circuit (Figure 19.75).