Chapter 15

1. Chapter 15

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

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

4. 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? • The leaves spread further apart. • The leaves get closer together. • One leaf moves higher, the other lower. • The leaves don’t move.

5. 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? • The leaves spread further apart. • The leaves get closer together. • One leaf moves higher, the other lower. • The leaves don’t move.

6. Charges A and B exert repulsive forces on each other. qA = 4qB. Which statement is true? • FA on B > FB on A • FA on B < FB on A • FA on B = FB on A

7. Charges A and B exert repulsive forces on each other. qA = 4qB. Which statement is true? • FA on B > FB on A • FA on B < FB on A • FA on B = FB on A

8. An electron is placed at the position marked by the dot. The force on the electron is • to the left. • to the right. • zero. • There’s not enough information to tell.

9. An electron is placed at the position marked by the dot. The force on the electron is • to the left. • to the right. • zero. • There’s not enough information to tell.

10. Rank in order, from largest to smallest, the electric field strengths E1 to E4 at points 1 to 4. • E2 > E4 > E1 > E3 • E2 > E1 = E4 > E3 • E2 > E1 > E4 > E3 • E1 = E2 > E3 = E4 • E1 > E2 > E3 > E4

11. Rank in order, from largest to smallest, the electric field strengths E1 to E4 at points 1 to 4. • E2 > E4 > E1 > E3 • E2 > E1 = E4 > E3 • E2 > E1 > E4 > E3 • E1 = E2 > E3 = E4 • E1 > E2 > E3 > E4

12. What is the SI unit of charge? • Coulomb • Faraday • Ampere • Ohm • Volt

13. What is the SI unit of charge? • Coulomb • Faraday • Ampere • Ohm • Volt

14. A charge alters the space around it. What is this alteration of space called? • Charged plasma • Charge sphere • Electric ether • Electric field • Electrophoresys

15. A charge alters the space around it. What is this alteration of space called? • Charged plasma • Charge sphere • Electric ether • Electric field • Electrophoresys

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

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

18. The electric field of a charge is defined by the force on • an electron. • a proton. • a source charge. • a test charge.

19. The electric field of a charge is defined by the force on • an electron. • a proton. • a source charge. • a test charge.