Ch 18 hw 1

Ch 18 hw 1 - 1.03113e-5 1.03e-05 m/s 4. 2/2 points | 2/4...

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1. 2/2 points | 2/4 submissions Last Response | Show Details All Responses Notes If 1.7 10 16 electrons enter a light bulb in 4 milliseconds, what is the magnitude of the electron current at that point in the circuit? 4.25e18 4.25e+18 electrons/second 2. 2/2 points | 3/4 submissions Last Response | Show Details All Responses Notes If an electron current is 3.9 10 19 electrons/s. What is the conventional current? 6.24 6.24 A 3. 2/2 points | 2/4 submissions Last Response | Show Details All Responses Notes The density of mobile electrons in copper metal is 8.4 10 28 m -3 . Suppose that i = 3.0 10 18 electrons/s are drifting through a copper wire. (This is a typical value for a simple circuit.) The diameter of the wire is 2.1 mm. What is the drift speed of the electrons?
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Unformatted text preview: 1.03113e-5 1.03e-05 m/s 4. 2/2 points | 2/4 submissions Last Response | Show Details All Responses Notes The density of mobile electrons in copper metal is 8.4 10 28 m-3 . Suppose that i = 4.4 10 18 electrons/s are drifting through a copper wire. (This is a typical value for a simple circuit.) The diameter of the wire is 1.3 mm. In this case, about how many minutes would it take for a single electron in the electron sea to drift from one end to the other end of a wire 29 cm long? 122.4757036 122 minutes (A puzzle: if the drift speed is so slow, how can a lamp light up as soon as you turn it on? We'll come back to this in the next chapter.)...
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This note was uploaded on 03/31/2008 for the course PY 208M taught by Professor Chabay during the Spring '08 term at N.C. State.

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