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Chapter 27: Q. 12 (page 762)
The current in an electric hair dryer is . How many electrons flow through the hair dryer in min?
The number of electrons flows through the hairdryer inis
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5. The electron drift speed is in a metal with a mean time between collisions of . What is the electric field strength?
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?
20. What electric field strength is needed to create a current in a -mm-diameter iron wire?
The current supplied by a battery slowly decreases as the battery runs down. Suppose that the current as a function of time is . What is the total number of electrons transported from the positive electrode to the negative electrode by the charge escalator from the time the battery is first used until it is completely dead?
electrons flow through a cross-section of a diameter iron wire in . What is the electron drift speed?
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