Name: Date: Unit 9: Electrostatics Electrostatics Problem Set 2 1. What is the current in a wire if 3.4 × 1019 electrons pass by a point in this wire every 60. seconds? A) 1.8 × 10–18 A C) 9.1 × 10–2 A B) 3.1 × 10–11 A D) 11 A 2. What is the current through a wire if 240 coulombs of charge pass through the wire in 2.0 minutes? A) 120 A C) 0.50 A B) 2.0 A D) 0.0083 A 3. The current through a lightbulb is 2.0 amperes. How many coulombs of electric charge pass through the lightbulb in one minute? A) 60. C C) 120 C B) 2.0 C D) 240 C 4. One coulomb per second is equal to one A) watt C) volt B) ohm D) ampere 5. When a neutral metal sphere is charged by contact with a positively charged glass rod, the sphere A) loses electrons C) loses protons B) gains electrons D) gains protons 6. A device commonly used to detect the presence of a static electric charge is A) a galvanometer C) a compass B) a voltmeter D) an electroscope 7. When an electroscope is charged by contact, the charging body always gives the electroscope A) B) C) D) a charge opposite that of the charging body the same charge as the charging body a negative charge a positive charge 8. Which procedure will give an electroscope a positive charge? A) touching the electroscope with a neutral object B) bringing a positively charged object near the electroscope C) touching the electroscope with a negatively charged object D) touching the electroscope with a positively charged object 9. If an uncharged electroscope is touched with a neutral object, the separation of the leaves of the electroscope will A) decrease B) increase C) remain the same Unit 9: Electrostatics 10. A positively charged object was used to give an electroscope a negative charge. The electroscope was charged by A) contact C) induction B) conduction D) reduction 13. A positively charged rod is held near the knob of a neutral electroscope. Which diagram best represents the distribution of charge on the electroscope? A) 11. When a positively charged body touches a neutral body, the neutral body will A) gain protons C) gain electrons B) lose protons D) lose electrons 12. Base your answer to the following question on An electroscope is a device with a metal knob, a metal stem, and freely hanging metal leaves used to detect charges. The diagram below shows a positively charged leaf electroscope. As a positively charged glass rod is brought near the knob of the electroscope, the separation of the electroscope leaves will A) decrease C) remain the same B) increase B) C) D) Unit 9: Electrostatics 14. In the diagram below, a cloth is brought near, but does not touch a neutral electroscope. The electroscope leaves separate. What charge, if any, does the cloth have? A) B) C) D) a positive charge a negative charge an unknown charge no charge 15. When a rod is brought near a neutral electroscope, the leaves diverge. Which statement best describes the charge on the rod? A) B) C) D) It must be positive. It must be negative. It may be neutral. It may be positive or negative. 16. Which diagram best represents the charge distribution on a neutral electroscope when a negatively charged rod is held near it? A) B) C) D) 17. Conductivity in metallic solids is due to the presence of free A) nuclei C) neutrons B) protons D) electrons 18. Electrical insulators are used to resist the flow of A) atoms C) neutrons B) molecules D) electrons 19. In the diagrams of charged objects shown below, which diagram correctly represents the direction of flow of electrons when the objects are connected by a conductor? A) B) C) D) Unit 9: Electrostatics 20. If an insulator replaces a conductor in an electrical circuit, the flow of electrons in the circuit will be A) less C) the same B) greater Answer Key Tuckahoe Electrostatics Prob Set 5 1. C 2. B 3. C 4. D 5. A 6. D 7. B 8. D 9. C 10. C 11. D 12. B 13. D 14. C 15. D 16. C 17. D 18. D 19. C 20. A