l. Protons and electrons a. repel each other b. attract each other e. do not interact 2. This force is directly related to the size of charges and inversely related to the distance between them. a. gravitational b. nuclear c. centripetal cl. electrical e. none of these 3. According to Law. electrical forces between point charges are normally stronger when charges are _ a. Coulomb's; close together b. Faraday's; far apart c. Newton's; F is constant everywhere t 4. Electrical forces between charges depend on a. the quantity ot'charge involved b. the distance between charges c. Both a, and b d. None 5. Change the distance between two charges by a factor of '23. and the electrical force between the charges changes by a factor of a. 4 b. 2 e. V: d. V4 e. none ofthese 6. Conservation of charge means that a. the total amount of charge in the universe is constant (1. charge can be neither created or destroyed b. electrons by themselves can be neither created nor destroyed. e. all of these c. no experimenter has ever seen charge destroyed by itself. T. [1' you comb your hair and the comb becomes positively charged, your hair becomes a. positively charged b. negatively charged e. uncharged 8. A difference between electrical forces and gravitational forces is that electrical forces include _ a. separation distance b. repulsive interactions c. inverse square law 9. In a good insulator. electrons are usually a. free to move around b. free to move around after an impurity has been added c. semi-free to move around cl. tightly bound to their own nucleus 10. Objects can be charged by a. friction b. conduction c. induction d. all of these e. none of these 11. Charging by induction requires the process of a. conduction b. electrication c. magnication d. grounding 12. Bring a charged object near a conductor and then briey touch the conductor. This demonstrates charge by a. induction b. deduction c. conduction d. electrication 13. Two charged particles held close to each other are released. As they move. the force on each particle increases. The particles have a, the same sign b. opposite signs c. not enough information given 14. A positive particle and a negatively charged particle held near each other are released. As they move. the force on each particle a. increases b. decreases c. stays the same 15. The SI unit ofcharge is a. Newton b. joulc c. ampere d. coulomb e. ohm 16. A negatively charged rod is brought near a metal can that rests on a wooden table. You touch the opposite side of the can momentarily with yottr nger. The can is then a. positively charged b. negatively chargcdc. uncharged d. charged the same as it was 17. An electroscope is charged positively as shown by foil leaves that diverge. As a negative charged rod is brought near the electroscope. the leaves a. converge (come together) b. diverge (spread apart) e. do not move 18. Two charges separated by one meter exert a one N force on each other. if the charges are pushed to a V4 meter separation, the force on each charge will be a. 1N b.2N c.4N d.8N e. 16N 19. What is the Law of Electric Charge? What is the Law of Conservation of Charge? 20. Describe the three methods of charging an object. How are the objects charged before and after? Give an example of each that you sawt'did in class. 21. Dene conductor and insulator. Give 2 examples of each. 22. Describe how an electroscope and a pith ball are used to detect charge. (diagrams might help you, too) 23. What is Coulomb '5 Law used to calculate? What does it mean to have a positive or negative answer? How are the variables related (direct, inverse, etc)? 24. How do like charges react to each other? How do unlike charges react? How do charged and uncharged objects react? 25. What is the direction of the electric eld around positive and negative charges? How do we Show the strength of the electric eld? 26. Draw the electric field lines for each of the following situations: a) a -2 charge b) a +1 and -3 charge c) a +2 and a +2 charge d) two charged parallel plates 27. How do you ground an object? What is the charge on the object after you ground it? 28. What is a neutral object? How does an object become charge positive? How does an object become charged negative? 29. How is charge distributed on a conductor? 30. A glass rod rubbed against your hair gains a charge of-1.4x10 C, while your hair ends up with equal and opposite charge. What is the electric force between the balloon and your hear when the two are separated by a distance of 0.071 m? 31. Suppose two charges are separated by 8.3x10-10 m. If the magnitude of the electric force between the charges is 3.34x10 N, and one charge is 1.5x10 " C, what is the value of the other charge? 32. Two electrostatic point charges of -1.3x10"C and -1.6x10"C exert repulsive forces on each other of 12.5 N. What is the distance between the two charges? 33. An electric field of 9.0 N/C is directed along the positive x-axis. What is the electric force on a -6.0 C charge in this field? 34. An electric field of 4.0x10 N/C is directed downward. If the electric force on a charge is 6.43x10 N, what is the charge? 35. An electron is held between two parallel plates that are separated by 0.006 m. The potential difference between the plates is 400 V. What is the electric field strength