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Chapter 27: Q. 20 (page 762)
20. What electric field strength is needed to create a current in a -mm-diameter iron wire?
The electric field strength is needed to create a current in a
-mm-diameter iron wire is .
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70. Two -diameter metal plates apart are charged to . They are suddenly connected together by a diameter copper wire stretched taut from the center of one plate to the center of the other.
a. What is the maximum current in the wire?
b. Does the current increase with time, decrease with time, or remain steady? Explain.
c. What is the total amount of energy dissipated in the wire?
Both batteries in FIGURE Q27.7 are ideal and identical, and all lightbulbs are the same. Rank in order, from brightest to least bright, the brightness of bulbs a to Explain.
The resistance of a very fine aluminum wire with a square cross section is role="math" localid="1649061344586" . A resistor is made by wrapping this wire in a spiral around a diameter glass core. How many turns of wire are needed?
An aluminum wire consists of the three segments shown in FIGURE P27.64. The current in the top segment is 10 A. For each of these three segments, find the a. Current I. b. Current density J. c. Electric field E. d. Drift velocity vd. e. Electron current i. Place your results in a table for easy viewing.
Suppose a time machine has just brought you forward from (post-Newton but pre-electricity) and you've been shown the lightbulb demonstration of FIGURE Q27.1. Do observations or simple measurements you might make-measurements that must make sense to you with your knowledge-prove that something is flowing through the wires? Or might you advance an alternative hypothesis for why the bulb is glowing? If your answer to the first question is yes, state what observations and/or measurements are relevant and the reasoning from which you can infer that something must be flowing. If not, can you offer an alternative hypothesis about why the bulb glows that could be tested?
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