Electricity and Magnetism Review

1. Which subatomic particle is negative?

• a. proton
• b. electron
• c. neutron
• d. nucleus

2. Gaining or losing _______________ creates a charge on a particle.

• a. protons
• b. neutrons
• c. electrons

3. Pick the best answer: Atoms have no electric charge when they

• a. have neutrons in their nucleus
• b. have an equal number of electrons and protons
• c. have an equal number of neutrons and protons

4. Bits of paper are attracted to the surface of this balloon. What attracts the paper pieces to the balloon?

• a. friction
• b. static electricity
• c. potential energy
• d. magnetism

5. If you put a negative and a positive charge together they will

• a. do nothing
• b. attract
• c. repel

6. A boy pulls a sweater off over his head. His hair is attracted to the sweater due to

• a. magnetic force
• b. a heat transfer
• c. a chemical change
• d. an electrical charge

7. What material would be safest to use as an insulator to cover electrical wires?

• a. aluminum
• b. tin
• c. rubber
• d. water

8. One balloon has an electrical charge of +6. Another has an electrical charge of +5. Which of the following would increase the attraction between these two electrically charged balloons?

• a. Increase the distance between them.
• b. Add 10 electrons to one of the balloons.
• c. Add protons to the balloon with the +6 charge.
• d. Decrease the distance between them.

9. Many electrical wires are wrapped with a plastic coating because plastic is

• a. less expensive than steel
• b. more dense than copper
• c. able to keep its shape
• d. a good insulator

10. Which of these substances conducts electricity the best?

• a. wood
• b. brick
• c. copper
• d. plastic