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QUIZ 15 Nota means none of the above. |
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| 1.What force binds atoms together to form molecules ? |
| a. gravitational |
| b. electrical |
| c. nota |
| 2. The main difference between gravitational and electric forces is that electrical forces |
| a. attract |
| b. repel or attract |
| c. obey the inverse square law |
| 3. The magnitude of the electric force between two charges depends only on the |
| a. the product of the two charges |
| b. the product of the two charges and the separation distance |
| c. the separation distance |
| 4.An electron and a proton |
| a. attract each other |
| b. repel each other |
| c. neither attract or repel each other |
| 5.Two charges separated by one meter repel each other with a 1-N force on each other. The two charges |
| a. are of the same sign |
| b. are of opposite signs |
| c.nota |
| 6. In the the previous problem, if the magnitude of each charge is doubled, then the force on each charge will be |
| a. 1 N |
| b. 2 N |
| c. 4 N |
| d. 8 N |
| e. nota |
| 7. Two charges separated by one meter attract each other with a 1-N force on each other. If the charges are pulled to a separation distance of 2 meters, the force of a attraction on each other will be |
| a. 1-N |
| b. 1/2 N |
| c. 1/4 N |
| d. 2 N |
| e. nota |
| 8. Suppose that the strength of the electric field at a certain distance from an isolated point charge has a value of 4 N/C . If the distance is doubled, then the electric field will have the value |
| a. 4 N/C |
| b. 2 N/C |
| c. 1 N/C |
| d. nota |
| 9. Suppose you place a free electron an electric field that point to the right. The electric force on the electron will point |
| a. right |
| b. left |
| 10. Suppose you place a free proton in an electric field that points to the right. The electric force on the proton will point |
| a. right |
| b. left |
| 11. If you were to expend 20 Joules of work to push a 2-coulomb test charge in a direction opposite (against) an electric field, what would be the voltage change with respect to the starting position? |
| a. 10 volts. |
| b. 20 volts |
| c. 40 voltages |
| 12. In the previous problem, what is the gain in potential energy the test charge? |
| a. 10 Joules |
| b. 20 Joules |
| c. 40 Joules |
| d. nota |