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Chapter 27: Q. 69 (page 765)
A flashlight battery is connected to a wire with a resistance of . FIGURE P27.69 shows the battery's potential difference as a function of time. What is the total charge lifted by the charge escalator?
The total charge lifted by the charge escalator is .
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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.
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?
What diameter should the nichrome wire in FIGURE P27.63 be in order for the electric field strength to be the same in both wires?
You've been asked to determine whether a new material your company has made is ohmic and, if so, to measure its electrical conductivity. Taking a sample, you wire the ends of the long axis to a power supply and then measure the current for several different potential differences. Your data are as follows:
| Voltage (V) | Current (A) |
| 0.200 | 0.47 |
| 0.400 | 1.06 |
| 0.600 | 1.53 |
| 0.800 | 1.97 |
Use an appropriate graph of the data to determine whether the material is ohmic and, if so, its conductivity.
The current in an electric hair dryer is . How many electrons flow through the hair dryer in min?
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