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Chapter 27: Q. 29 (page 762)
The electric field inside a long copper wire is . What is the potential difference between the ends of the wire?
The potential difference between the ends of the wire is
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Which, if any, of these statements are true? (More than one may be true.) Explain. Assume the batteries are ideal.
a. A battery supplies the energy to a circuit.
b. A battery is a source of potential difference; the potential difference between the terminals of the battery is always the same.
c. A battery is a source of current; the current leaving the battery is always the same.
The conducting path between the right hand and the left hand can be modeled as a 10-cm-diameter, 160-cm-long cylinder. The average resistivity of the interior of the human body is 5.0 Ω m. Dry skin has a much higher resistivity, but skin resistance can be made negligible by soaking the hands in salt water. If skin resistance is neglected, what potential difference between the hands is needed for a lethal shock of 100 mA across the chest? Your result shows that even small potential differences can produce dangerous currents when the skin is wet.
25. A battery provides of current.
a. At what rate is charge lifted by the charge escalator?
b. How much work does the charge escalator do to lift of charge?
c. What is the power output of the charge escalator?
A electric field creates a electrons/s current in a diameter aluminum wire. What are (a) the drift speed and (b) the mean time between collisions for electrons in this wire?
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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