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Chapter 27: Q. 8 (page 762)
The mean time between collisions in iron is . What electron current is driven through a diameter iron wire by a role="math" localid="1648885652366" electric field ?
The amount of electron current is driven through a diameter iron wire by aelectric field islocalid="1648885800944" .
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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.
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?
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?
A circuit calls for a diameter copper wire to be stretched between two points. You don't have any copper wire, but you do have aluminum wire in a wide variety of diameters. What diameter aluminum wire will provide the same resistance?
The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and calcium, that are dissolved in water as ions. These ions enter cells through narrow pores in the cell membrane known as ion channels. Each ion channel, which is formed from a specialized protein molecule, is selective for one type of ion. Measurements with microelectrodes have shown that a diameter potassium ion channel carries a current of role="math" localid="1649134390247" .
a. How many potassium ions pass through if the ion channel opens for ?
b. What is the current density in the ion channel?
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