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Chapter 27: Q. 23 (page 762)
23. A -mm-diameter silver wire carries a current. What are (a) the electric field and (b) the electron drift speed in the wire?
(a) The electric field is .
(b) The electron drift speed in the wire is .
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Is FIGURE Q27.4 a possible surface charge distribution for a current-carrying wire? If so, in which direction is the current? If not, why not?
Pencil "lead" is actually carbon. What is the current if a potential difference is applied between the ends of a diameter, long lead from a mechanical pencil?
20. What electric field strength is needed to create a current in a -mm-diameter iron wire?
Household wiring often uses diameter copper wires. The wires can get rather long as they snake through the walls from the fuse box to the farthest corners of your house. What is the potential difference across a long, diameter copper wire carrying an current?
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