1. Chapter 25

2. To determine if an object has “glass charge,” you need to
1. see if the object repels a charged glass rod.
2. see if the object attracts a charged plastic rod.
3. Both 1 and 2.
4. Either 1 or 2.
STT25.1

3. To determine if an object has “glass charge,” you need to
1. see if the object repels a charged glass rod.
2. see if the object attracts a charged plastic rod.
3. Both 1 and 2.
4. Either 1 or 2.
STT25.1

4. 1. qa > qe > qd > qc > qb
Rank in order, from most positive to most negative, the charges qa to qe of these five systems.
1. qa > qe > qd > qc > qb
2. qa = qb > qe > qc > qd
3. qd > qc > qe > qa = qb
4. qd > qc > qe > qa > q
5. qe > qa > qd > qb > qc
STT25.2

5. 1. qa > qe > qd > qc > qb
Rank in order, from most positive to most negative, the charges qa to qe of these five systems.
1. qa > qe > qd > qc > qb
2. qa = qb > qe > qc > qd
3. qd > qc > qe > qa = qb
4. qd > qc > qe > qa > qb
5. qe > qa > qd > qb > qc
STT25.2

6. 1. The leaves spread further apart. 2. The leaves get closer together.
An electroscope is positively charged by touching it with a positive glass rod. The electroscope leaves spread apart and the glass rod is removed. Then a negatively charged plastic rod is brought close to the top of the electroscope, but it doesn’t touch. What happens to the leaves?
1. The leaves spread further apart.
2. The leaves get closer together.
3. One leaf moves higher, the other lower.
4. The leaves don’t move.
STT25.3

7. 1. The leaves spread further apart. 2. The leaves get closer together.
An electroscope is positively charged by touching it with a positive glass rod. The electroscope leaves spread apart and the glass rod is removed. Then a negatively charged plastic rod is brought close to the top of the electroscope, but it doesn’t touch. What happens to the leaves?
1. The leaves spread further apart.
2. The leaves get closer together.
3. One leaf moves higher, the other lower.
4. The leaves don’t move.
STT25.3

8. Charges A and B exert repulsive forces on each other. qA = 4qB
Charges A and B exert repulsive forces on each other. qA = 4qB. Which statement is true?
STT25.4
1. FA on B > FB on A
2. FA on B < FB on A
3. FA on B = FB on A

9. Charges A and B exert repulsive forces on each other. qA = 4qB
Charges A and B exert repulsive forces on each other. qA = 4qB. Which statement is true?
STT25.4
1. FA on B > FB on A
2. FA on B < FB on A
3. FA on B = FB on A

10. 4. There’s not enough information to tell.
An electron is placed at the position marked by the dot. The force on the electron is
1. to the left.
2. to the right.
3. zero.
4. There’s not enough information to tell.
STT25.5

11. 4. There’s not enough information to tell.
An electron is placed at the position marked by the dot. The force on the electron is
1. to the left.
2. to the right.
3. zero.
4. There’s not enough information to tell.
STT25.5

12. Rank in order, from largest to smallest, the electric field strengths E1 to E4 at points 1 to 4.
1. E2 > E4 > E1 > E3
2. E2 > E1 = E4 > E3
3. E2 > E1 > E4 > E3
4. E1 = E2 > E3 = E4
5. E1 > E2 > E3 > E4
STT25.6

13. Rank in order, from largest to smallest, the electric field strengths E1 to E4 at points 1 to 4.
1. E2 > E4 > E1 > E3
2. E2 > E1 = E4 > E3
3. E2 > E1 > E4 > E3
4. E1 = E2 > E3 = E4
5. E1 > E2 > E3 > E4
STT25.6

14. Chapter 25
Reading Quiz

15. What is the SI unit of charge?
1. Coulomb
2. Faraday
3. Ampere
4. Ohm
5. Volt
IG25.1

16. What is the SI unit of charge?
1. Coulomb
2. Faraday
3. Ampere
4. Ohm
5. Volt
IG25.1

17. A charge alters the space around it
A charge alters the space around it. What is this alteration of space called?
1. Charged plasma
2. Charge sphere
3. Electric ether
4. Electric field
5. Electrophoresys
IG25.2

18. A charge alters the space around it
A charge alters the space around it. What is this alteration of space called?
1. Charged plasma
2. Charge sphere
3. Electric ether
4. Electric field
5. Electrophoresys
IG25.2

19. 1. because of magnetic effects.
If a negative charged rod is held near a neutral metal ball, the ball is attracted to the rod. This happens
1. because of magnetic effects.
2. because the ball tries to pull the rod’s electrons over to it.
3. because the rod polarizes the metal.
4. because the rod and the ball have opposite charges.
IG25.3

20. 1. because of magnetic effects.
If a negative charged rod is held near a neutral metal ball, the ball is attracted to the rod. This happens
1. because of magnetic effects.
2. because the ball tries to pull the rod’s electrons over to it.
3. because the rod polarizes the metal.
4. because the rod and the ball have opposite charges.
IG25.3

21. The electric field of a charge is defined by the force on
1. an electron.
2. a proton.
3. a source charge.
4. a test charge.
IG25.4

22. The electric field of a charge is defined by the force on
1. an electron.
2. a proton.
3. a source charge.
4. a test charge.
IG25.4