UNIT 3 TEST ANSWERS
1. C
2. B
3. C
4. D
5. D
6. A
7. C
8. B
9. B
10. C
11. J
12. H
13. C
14. I
15. D
16. K
17. A
18. G
19. B
20. E
21. Neutral should show equal number of (+) and (Å|); negative should show more (Å|) than (+); and positive
should show more (+) than (Å|).
22. (a) An insulator does not allow electrons to move freely. A conductor allows electrons to move freely.
(b) Students°¶ answers may vary but could include plastic or glass for insulator, and any type of metal
for conductor.
23. In conduction, electrons transfer from one object to the other. When charging by induction, the electrons
relocate within the material but do not transfer from one object to the other.
24. (a) increases
(b) decreases
(c) increases
25. A charged object will attract both an oppositely charged object and a neutral object. A like-charged object
would repel and the neutral object would still attract.
27. (a) 20 ð
(b) 5.0 mA
(c) (i) 1000 ð; (ii) 20 V
1. C
2. B
3. C
4. D
5. D
6. A
7. C
8. B
9. B
10. C
11. J
12. H
13. C
14. I
15. D
16. K
17. A
18. G
19. B
20. E
21. Neutral should show equal number of (+) and (Å|); negative should show more (Å|) than (+); and positive
should show more (+) than (Å|).
22. (a) An insulator does not allow electrons to move freely. A conductor allows electrons to move freely.
(b) Students°¶ answers may vary but could include plastic or glass for insulator, and any type of metal
for conductor.
23. In conduction, electrons transfer from one object to the other. When charging by induction, the electrons
relocate within the material but do not transfer from one object to the other.
24. (a) increases
(b) decreases
(c) increases
25. A charged object will attract both an oppositely charged object and a neutral object. A like-charged object
would repel and the neutral object would still attract.
27. (a) 20 ð
(b) 5.0 mA
(c) (i) 1000 ð; (ii) 20 V