QUIZ 15 Chapter 22 

1.What force binds atoms together to form molecules ? 
a. gravitational 
b. nuclear 
c. magical 
d. nota 
2. When I rubbed an inflated balloon in my hair, I gave an example of charging by 
a. contact 
b. friction 
c. induction 
d. nota 
3. After rubbing it in my hair, I placed the inflated balloon of the previous problem against the classroom wall and it stuck . Why did the balloon stick to the wall? 
a. The negatively charged balloon polarized atoms in the wall and created a positively charged surface on the wall that attracted the balloon. 
b. The positively charged balloon polarized atoms in the wall and created a negatively charged surface on the wall that attracted the balloon. 
c. nota 
4. Electrical forces are similar to gravitational forces because electrical forces 
a. attract or repel 
b. obey the inverse square law 
c. nota 
5. The magnitude of the electric force between two charges depends only on the 
a. the product of the masses of the two charges 
b. the product of the two charges 
c. the product of the two charges and the separation distance 
d. the separation distance and the product of the masses of the two charges 
e. nota 
6. An electron and a neutron 
a. attract each other 
b. repel each other 
c. neither attract or repel each other 
7.Two charges separated by 3 meters attract each other with a 1N force on each other. The two charges 
a. are of the same sign 
b. are of opposite signs 
c.nota 
8. In the the previous problem, if the magnitude of each charge is tripled, then the force on each charge will be 
a. 3 N 
b. 9 N 
c. 1 N 
d. 8 N 
e. nota 
9. In problem 7, if the two charges are pulled to a separation distance of 6 meters, the force of attraction on each other will be 
a. 1N 
b. 1/2 N 
c. 1/4 N 
d. 2 N 
e. nota 
10. Suppose that the strength of the electric field at a certain distance from an isolated point charge has a value of 2 N/C . If the distance is doubled, then the electric field will have the value 
a. 4 N/C 
b. 1 N/C 
c. 1/2 N/C 
d. nota 
11. Suppose you place a free proton in an electric field that points vertically down. The electric force on the proton will point 
a. up 
b. down 
12. Suppose you place a free electron in an electric field that points vertically up. The electric force on the electron will point 
a. up 
b. down 
13. Suppose you expend 20 Joules of work to push a 4coulomb positive test charge in a direction opposite (against) an electric field. What is the gain in potential energy of the test charge? 
a. 80 Joules 
b. 20 Joules 
c. 5 Joules 
14. In the previous problem, what is the change in potential between the test charge's initial location and the test charge's final location? 
a. 80 Volts 
b. 16 Volts 
c. 5 Volts 
d. nota 
15. The net charge of a fully charged capacitor is 
a. positive 
b. negative 
c. zero 
16. The net charge of a fully discharged capacitor is 
a. positive 
b. negative 
c. zero 
17. True or False. The energy stored in a capacitor is stored in the
electric field between the plates. a. True 
b. False 