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Chapter 27: Q. 1 (page 762)

1.0脳1020electrons flow through a cross-section of a 2.0mmdiameter iron wire in 5.0s. What is the electron drift speed?

Short Answer

Expert verified

The electron drift speed is75渭m/s.

Step by step solution

01

Given Information 

Number of electrons flow through=1.0脳1020

Diameter=2.0mm

Time=5.0s

02

Explanation 

The definition of the electron current includes the electron drift speed, which can be expressed as:

ie=neAvd鈬�vd=ieneA

The electron current is just the number of electrons per unit time,

ie=Net

The area of the cross-section, since the latter is a circle, will be

A=蟺D24

Combining, we can find

vd=Ne/tne蟺D2/4=4Ne蟺netD2

Substitute the values,

role="math" localid="1648798324977" vd=4脳1020e蟺路8.5路1028e脳5s脳0.002mm2

=7.5路10-5m/s.

03

Final Answer 

Hence, the electron drift speed is75渭m/s.

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Most popular questions from this chapter

2. Consider a lightbulb circuit such as the one in FIGURE Q27.1.

a. From the simple observations and measurements you can make on this circuit, can you distinguish a current composed of positive charge carriers from a current composed of negative charge carriers? If so, describe how you can tell which it is. If not, why not?

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