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Chapter 18: Q3PE (page 664)
To start a car engine, the car battery moves 3.75×1021 electrons through the starter motor. How many coulombs of charge were moved?
To start a car engine \({\rm{ - 600 C}}\) of charge were moved.
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A cell membrane is a thin layer enveloping a cell. The thickness of the membrane is much less than the size of the cell. In a static situation the membrane has a charge distribution of −2.5×10−6 C/m2 on its inner surface and +2.5×10−6 C/m2 on its outer surface. Draw a diagram of the cell and the surrounding cell membrane. Include on this diagram the charge distribution and the corresponding electric field. Is there any electric field inside the cell? Is there any electric field outside the cell?
(a) Two point charges totaling\({\bf{8}}.{\bf{00}}{\rm{ }}{\bf{\mu C}}\)exert a repulsive force of\({\bf{0}}.{\bf{150}}{\rm{ }}{\bf{N}}\)on one another when separated by\({\bf{0}}.{\bf{500}}{\rm{ }}{\bf{m}}\). What is the charge on each? (b) What is the charge on each if the force is attractive?
Calculate the magnitude of the electric field 2.00 m from a point charge of 5.00 mC (such as found on the terminal of a Van de Graaff).
Suppose a woman carries an excess charge. To maintain her charged status can she be standing on ground wearing just any pair of shoes? How would you discharge her? What are the consequences if she simply walks away?
Why does a car always attract dust right after it is polished? (Note that car wax and car tires are insulators.)
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