Chapter 27: Q. 20 (page 762)
20. What electric field strength is needed to create a current in a -mm-diameter iron wire?
Short Answer
The electric field strength is needed to create a current in a
-mm-diameter iron wire is .
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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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.
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The current in a lightbulb is . The filament inside the bulb is in diameter.
a. What is the current density in the filament?
b. What is the electron current in the filament?
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