Chapter 16: Q4Q (page 443)
Why does a plastic ruler that has been rubbed with a cloth have the ability to pick up small pieces of paper? Why is this difficult to do on a humid day?
Due to the generation of static energy.
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(II) Determine the magnitude and direction of the electric field at a point midway between a \( - {\bf{8}}{\bf{.0}}{\rm{ }}\mu {\bf{C}}\) and a\( + 5.8{\rm{ }}\mu {\bf{C}}\)charge 6.0 cm apart. Assume no other charges are nearby.
Consider the electric field at the three points indicated by the letters A, B, and C in Fig. 16–49. First draw an arrow at each point indicating the direction of the net force that a positive test charge would experience if placed at that point, then list the letters in order of decreasing field strength (strongest first). Explain.
(III) Two small nonconducting spheres have a total charge of \({\bf{90}}{\bf{.0}}\;{\bf{\mu C}}\). (a) When placed 28.0 cm apart, the force each exerts on the other is 12.0 N and is repulsive. What is the charge on each? (b) What if the force were attractive?
How close must two electrons be if the magnitude of the electric force between them is equal to the weight of either at the Earth’s surface?
Measurements indicate that there is an electric field surrounding the Earth. Its magnitude is about 150 N/C at the Earth’s surface and points inward toward the Earth’s center. What is the magnitude of the electric charge on the Earth? Is it positive or negative? (Hint: The electric field outside a uniformly charged sphere is the same as if all the charge were concentrated at its center.)
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