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Reading Quiz: Electric Fields

Answers must be submitted by 9:00am Wednesday, January 30. You may not compare your answers with other students' answers before you submit !

Reading: CP Chapter 33 Sections 1 and 2, 3, 7 + pp. 511-512 about thunderstorms. You might also want to review your notes from PH306 about gravitational fields.

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1. What objects create an electric field ? I am looking for a very general answer, not a specific example. (3 words or fewer)

2. What does an electric field do ? Again, I want a general answer, not a specific example. (6 words or fewer)

3. What are the SI units of electric field ?

4. Let E be the magnitude of a certain electric field. Let q be the charge of an object somewhere in that electric field. In terms of those two variables, give a formula for the magnitude of the force made by the electric field on the charge. Felectric =

5. Give a formula for the magnitude of the electric field made by an object of charge Q at a distance R from the center of the object. hint: think about the analogy between Coulomb's law and Newton's law of Universal Gravitation. 

E =

6. Examine closely the diagrams in Figure 33.4. Which diagram (a, b, or c) represents an electric field that is nearly constant in magnitude ? Explain briefly (6 words or fewer) how you can tell from the diagram:

7. The text on p. 519 talks about a "positive test charge." If such a test charge were placed at a position halfway between the two charges in Figure 33.4, in what direction would the test charge experience a force ? Choose your answers from the following: left, right, up, down

In what direction is the electric field at the position halfway between the two charges in Figure 33.4 ? (up, down, left or right)

8. Examine Figure 33.8 carefully. Are the objects in the figure conductors, or insulators ? At what position(s) inside the square object do you think the electric field is strongest ? Explain briefly.

9. In Figure 33.17, which Van de Graaf generator (the large one that the girl is touching, or the small one that she isn't touching) would be able to hold the most charge before electrical breakdown of the air surrounding the Van de Graaf occurs ? (one word, large or small)

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