1. Electrostatics Review

2. What happens when a rubber rod is rubbed with a piece of fur, giving the rod a negative charge? 1.Protons are removed from the rod. 2.Electrons are added to the rod. 3.The fur is also negatively charged. 4.The fur is left neutral.

3. Which of the following is NOT true for BOTH gravitational and electric forces? 1.The inverse square distance law applies. 2.Forces are conservative. 3.Potential energy is a function of distance of separation. 4.Forces are either attractive or repulsive.

4. As the difference in charges increases between two parallel plate capacitors, which of the following increases? 1.Force of repulsion 2.Size of the capacitor 3.Electric potential energy of the electrons 4.Movement of the protons

5. The electric field line arrows around a proton point 1.Away from the proton 2.Towards the proton 3.To the left of the proton 4.Upwards from the protons

6. How is the magnitude of the charges proportional to the electric force between them? 1.Directly 2.Inversely 3.Exponentially

7. A charge of +3 C is located at y = 3m, and a charge of -7C is located at y = 8m. The direction of the force on the positive charge will be 1.Upward 2.Downward 3.To the right 4.Zero

8. What is the direction of the electric field at a point to the left of a negatively charged object 1.Upward 2.Downward 3.To the left 4.To the right

9. A charge of +3 C is located at y = 3m, and a charge of +5C is located at y = 5m. The direction of the force on the +5C charge will be 1.Upward 2.Downward 3.To the right 4.Zero

10. How is the square of the distance between two charges proportional to the electric force between them? 1.Directly 2.Inversely 3.Exponentially

11. What is the direction of the electric field at a point directly above a positively charged object? 1.Upward 2.Downward 3.To the left 4.To the right

12. Which of the following methods of charging does not involve physical touching? 1.Contact 2.Induction 3.Friction 4.Seduction

13. When a positively charged object comes close to a neutral object, the neutral object will: 1.Be attracted 2.Be repelled 3.Do nothing

14. A charged rod is brought close to a neutral electroscope. When touched by the rod, the leaves both become positive and repel. The rod must have been … 1.Positively charged 2.Negatively charged 3.Not enough information to tell

15. The distance between two like charges is tripled. The force of repulsion between them will: 1.Increase by 3 times 2.Increase by 9 times 3.Be 1/27 of the original force 4.Be 1/9 of the original force

16. Which sentence best characterizes electric insulators? 1.Charges on their surface do not move throughout. 2.They have high tensile strength 3.Electric charges move freely in throughout. 4.They are good heat conductors.

17. Which of the following is not true about electric field lines? 1.They cannot cross. 2.They are proportional to the amount of charge present. 3.They are used to visualize an electric field strength. 4.They congregate more on smooth objects, not on pointy objects.

18. A neutral electroscope is charged by induction. When brought close to the rod, the leaves both become negative and repel. The rod must have been … 1.Positively charged 2.Negatively charged 3.Not enough information to tell

19. A positively charged rod is brought close to a neutral electroscope to charge it by induction. The top of the electroscope must be: 1.Positively charged 2.Negatively charged 3.Not enough information to tell