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Chapter 27: Q. 39 (page 763)
For what electric field strength would the current in a diameter nichrome wire be the same as the current in a diameter aluminum wire in which the electric field strength is?
The electric field strength is.
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Variations in the resistivity of blood can give valuable clues about changes in various properties of the blood. Suppose a medical device attaches two electrodes into a diameter vein at positions role="math" localid="1649141775053" apart. What is the blood resistivity if a potential difference causes a current through the blood in the vein?
2. Consider a lightbulb circuit such as the one in FIGURE Q27.1.
a. From the simple observations and measurements you can make on this circuit, can you distinguish a current composed of positive charge carriers from a current composed of negative charge carriers? If so, describe how you can tell which it is. If not, why not?
b. One model of current is the motion of discrete charged particles. Another model is that current is the flow of a continuous charged fluid. Do simple observations and measurements on this circuit provide evidence in favor of either one of these models? If so, describe how. If not, why not?
The electron drift speed in a diameter gold wire is . How long does it take 1 mole of electrons to flow through a cross section of the wire?
75. A capacitor is charged to , then connected in parallel with a resistor. The capacitor will discharge because the resistor provides a conducting pathway between the capacitor plates, but much more slowly than if the plates were connected by a wire. Let be the instant the fully charged capacitor is first connected to the resistor. At what time has the capacitor voltage decreased by half, to ?
Hint: The current through the resistor is related to the rate at which charge is leaving the capacitor. Consequently, you'll need a minus sign that you might not have expected.
Energetic particles, such as protons, can be detected with a silicon detector. When a particle strikes a thin piece of silicon, it creates a large number of free electrons by ionizing silicon atoms. The electrons flow to an electrode on the surface of the detector, and this current is then amplified and detected. In one experiment, each incident proton creates, on average, electrons; the electron current is amplified by a factor of ; and the experimenters record an amplified current of . How many protons are striking the detector per second?
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