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Chapter 23: Q. 3 (page 653)
The electric field strength from a very long charged wire is . What is the electric field strength from the wire?
The electric field strength at from the wire is.
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In Problems 63 through 66 you are given the equation(s) used to solve a problem. For each of these
a. Write a realistic problem for which this is the correct equation(s).
b. Finish the solution of the problem
Twodiameter charged disks face each other, apart. The left disk is charged to and the right disk is charged to.
a. What is the electric field, both magnitude and direction, at the midpoint between the two disks?
b. What is the forceon acharge placed at the midpoint?
What are the strength and direction of the electric field at the position indicated by the dot in ? Give your answer in component form and as a magnitude and angle measured or (specify which) from the positive -axis.
A proton and an electron are released from rest in the center of a capacitor.
a. Is the force ratio greater than less than, or equal to? Explain.
b. Is the acceleration ratio greater than , less than , or equal to? Explain.
The combustion of fossil fuels produces micron-sized particles of soot, one of the major components of air pollution. The terminal speeds of these particles are extremely small, so they remain suspended in air for very long periods of time. Furthermore, very small particles almost always acquire small amounts of charge from cosmic rays and various atmospheric effects, so their motion is influenced not only by gravity but also by the earth's weak electric field. Consider a small spherical particle of radius , density , and charge . A small sphere moving with speed v experiences a drag force , where is the viscosity of the air. (This differs from the drag force you learned in Chapter 6 because there we considered macroscopic rather than microscopic objects.)
a. A particle falling at its terminal speed is in equilibrium with no net force. Write Newton's first law for this particle falling in the presence of a downward electric field of strength , then solve to find an expression for .
b. Soot is primarily carbon, and carbon in the form of graphite has a density of . In the absence of an electric field, what is the terminal speed in of a -diameter graphite particle? The viscosity of air at is .
c. The earth's electric field is typically (150 N/C , downward). In this field, what is the terminal speed in of a -diameter graphite particle that has acquired 250 extra electrons?
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