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Unformatted text preview: Chapter 15, Electric Forces and Electric Fields C HAPTER 15 Conceptual Questions C1. Object A has a charge q on it, object B has a charge q on it, and object C has a charge 2 q on it. These charges are arranged, one each, at the vertices of an equilateral triangle. Which charge has the greatest magnitude electric force on it? a. A b. B c. C d. All have equal magnitude forces on them. C2. Three equal positive charges are placed on the x-axis, one at the origin, one at x = 2 m, and the third at x = 4 m. Of the following points, which has the greatest magnitude electric field? a. x = 1 m b. x = 3 m c. x = 5 m d. The electric field has the same magnitude at all three positions. C3. Charges q , q , and q are placed on the x-axis at x = 0, x = 2 m, and x = 4 m, respectively. At which of the following points does the electric field have the greatest magnitude? a. x = 1 m b. x = 3 m c. x = 5 m d. The electric field has the same magnitude at all three positions. C4. Two small objects are suspended from threads. When the objects are moved close together, they attract one another. Which of the following could produce this result? a. One object is positively charged and the other is negatively charge. b. One object is positively charged and the other is uncharged. c. One object is negatively charged and the other is uncharged. d. All of the above could result in such attraction. C5. A spherical surface surrounds a point charge it its center. If the charge is doubled and if the radius of the surface is also doubled, what happens to the electric flux E out of the surface and the magnitude E of the electric field at the surface as a result of these doublings? a. E and E do not change. b. E increases and E remains the same. c. E increases and E decreases. d. E increases and E increases. 1 Chapter 15, Electric Forces and Electric Fields 15.1 Properties of Electric Charges 1. Doug rubs a piece of fur on a hard rubber rod, giving the rod a negative charge. What happens? a. Protons are removed from the rod. b. Electrons are added to the rod. c. The fur is also charged negatively. d. The fur is left neutral. 2. A repelling force must occur between two charged objects under which conditions? a. Charges are of unlike signs. b. Charges are of like signs. c. Charges are of equal magnitude. d. Charges are of unequal magnitude. 3. When a glass rod is rubbed with silk, which of the following statements best describes what happens? a. Electrons are removed from the rod. b. Protons are removed from the silk. c. The silk is charged positively. d. The silk remains neutral. 4. A metallic object holds a charge of - 3.8 10- 6 C. What total number of electrons does this represent? ( e = 1.6 10- 19 C is the magnitude of the electronic charge.) a. 4.2 10 14 b. 6.1 10 13 c. 2.4 10 13 d. 1.6 10 14 5. When charging two objects by rubbing them together: a. Neither may be a conductor....
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