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?
Short Answer
To start a car engine \({\rm{ - 600 C}}\) of charge were moved.
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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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An amoeba has protons and a net charge of 0.300 pC . (a) How many fewer electrons are there than protons? (b) If you paired them up, what fraction of the protons would have no electrons?
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?
What is the force on the charge located at \(x = 8.00{\rm{ }}cm\) in Figure 18.52(a) given that \(q = 1.00{\rm{ }}\mu C\)?

Figure 18.52 (a) Point charges located at \[{\bf{3}}.{\bf{00}},{\rm{ }}{\bf{8}}.{\bf{00}},{\rm{ }}{\bf{and}}{\rm{ }}{\bf{11}}.{\bf{0}}{\rm{ }}{\bf{cm}}\] along the x-axis. (b) Point charges located at \[{\bf{1}}.{\bf{00}},{\rm{ }}{\bf{5}}.{\bf{00}},{\rm{ }}{\bf{8}}.{\bf{00}},{\rm{ }}{\bf{and}}{\rm{ }}{\bf{14}}.{\bf{0}}{\rm{ }}{\bf{cm}}\] along the x-axis
At what distance is the electrostatic force between two protons equal to the weight of one proton?
Figure 18.47 shows the electric field lines near two charges q1 and q2. What is the ratio of their magnitudes? (b) Sketch the electric field lines a long distance from the charges shown in the figure.

Figure 18.47 The electric field near two charges
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