# CHAPTER 15 PRE-TEST: ELECTRIC FORCE AND FIELDS

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1 Class: Date: CHAPTER 5 PRE-TEST: ELECTRIC FORCE AND FIELDS Multiple Choice Identify the choice that best completes the statement or answers the question.. What happens when a rubber rod is rubbed with a piece of fur, giving it a negative charge? a. Protons are removed from the rod. c. Electrons are added to the fur. b. Electrons are added to the rod. d. The fur is left neutral. 2. A repelling force occurs between two charged objects when the charges are of a. unlike signs. c. equal magnitude. b. like signs. d. unequal magnitude. 3. Electric charge is a. found only in a conductor. c. found only in insulators. b. conserved. d. not conserved. 4. Charge is most easily transferred in a. nonconductors. c. semiconductors. b. conductors. d. insulators. 5. In the diagram shown above, the circles represent small balls that have electric charges. Ball has a negative charge, and ball 2 is repelled by ball. Next, you see that ball 2 repels ball 3 and that ball 3 attracts ball 4. What is the electric charge on ball 4? a. Ball 4 may have either a positive or negative charge. b. Ball 4 has a negative charge. c. Ball 4 has a positive charge. d. It is not possible to determine the charge on ball Which statement is the most correct regarding electric insulators? a. Charges within electric insulators do not readily move. b. Electric insulators have high tensile strength. c. Electric charges move freely in electric insulators. d. Electric insulators are good heat conductors.

2 7. The figure shown above demonstrates charging by a. grounding. c. polarization. b. induction. d. contact. 8. Conductors can be charged by, while insulators cannot. a. grounding c. polarization b. induction d. contact 9. Which of the following is not true for both gravitational and electric forces? a. The inverse square distance law applies. b. Forces are proportional to physical properties. c. Potential energy is a function of distance of separation. d. Forces are either attractive or repulsive. 0. Two point charges, initially 2 cm apart, are moved to a distance of 0 cm apart. By what factor does the resulting electric force between them change? a. 25 c. 5 b. 5 d. 25. If the charge is tripled for two identical charges maintained at a constant separation, the electric force between them will be changed by what factor? a. 9 c. 9 b. 2 3 d Two positive charges, each of magnitude q, are on the y-axis at points y = +a and y = a. Where would a third positive charge of the same magnitude be located for the net force on the third charge to be zero? a. at the origin c. at y = 2a b. at y = 2a d. at y = a 2

3 3. Which is the most correct statement regarding the drawing of electric field lines? a. Electric field lines always connect from one charge to another. b. Electric field lines always form closed loops. c. Electric field lines can start on a charge of either polarity. d. Electric field lines never cross each other. 4. The relative distribution of charge density on the surface of a conducting solid depends upon which of the following? a. the shape of the conductor b. the mass density of the conductor c. the type of metal the conductor is made of d. the strength of Earth s gravitational field 5. Where is the electric field of an isolated, uniformly charged, hollow metallic sphere greatest? a. at the center of the sphere c. at infinity b. at the sphere s inner surface d. at the sphere s outer surface 6. A conductor that is in electrostatic equilibrium has an electric field inside the conductor that a. depends on the radius of the conductor. b. is zero. c. is greatest near the conductor s surface. d. is parallel to the surface of the conductor. 7. The electric field just outside a charged conductor in electrostatic equilibrium is a. zero. b. at its minimum level. c. the same as it is in the center of the conductor. d. perpendicular to the conductor s surface. 8. Electric field strength depends on a. charge and distance. c. Coulomb constant and mass. b. charge and mass. d. elementary charge and radius. 9. Resultant force on a charge is the sum of the individual forces on that charge. a. scalar c. individual b. vector d. negative Short Answer 20. Explain what happens when you vigorously rub your wool socks on a carpeted floor, touch a metal doorknob, and get a shock. 2. What property was discovered in Millikan s experiments? Explain this property. 22. An object that has a negative electric charge has an abundance of atomic particles called. 23. When an object loses electrons, it acquires a(n) electric charge. 3

4 24. Draw the lines of force representing the electric field surrounding two objects that have equal magnitude charges of opposite polarity. 25. In the figure shown above, why do only half of the lines originating from the positive charge terminate on the negative charge? 26. Draw the lines of force representing the electric field around an electron. 27. Draw the lines of force representing the electric field around two charges if both charges are positive and of the same magnitude. 28. The diagram shown above represents a cross section of a copper rod that is electrostatically charged. Which of the arrows A, B, C, or D best represents a field line in the rod s electric field? Explain your choice. Problem 29. What is the electric force between an electron and a proton that are separated by a distance of m? Is the force attractive or repulsive? (e = C, k C = N m 2 /C 2 ) 4

5 30. Two equal charges are separated by m. The force between the charges has a magnitude of N. What is the magnitude of q on the charges? (k C = N m 2 /C 2 ) 3. A thundercloud has an electric charge of 43.2 C near the top of the cloud and 38.7 C near the bottom of the cloud. The magnitude of the electric force between these two charges is N. What is the average separation between these charges? (k C = N m 2 /C 2 ) 32. Two equal positive charges, both q = C, interact with a third charge, Q = C, as shown in the figure above. What is the magnitude of the electric force on Q? (k C = N m 2 /C 2 ) 33. Two point charges are 0.0 cm apart and have charges of 2.0 μc and 2.0 μc, respectively. What is the magnitude of the electric field at the midpoint between the two charges? 34. Charges of 4.0 μc and 6.0 μc are placed at two corners of an equilateral triangle with sides of 0.0 m. What is the magnitude of the electric field created by these two charges at the third corner of the triangle? 35. An electric field of 3279 N/C is produced by a charge of C. For this field strength, what is the distance to the charge? (k C = Nm 2 /C 2 ) 5

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