1. Naturally occurring magnetic rocks are called what?
2. Magnetic properties have been known for about how long?
3. Magnets have been used as compasses since at least when?
4. List devices whose operation is affected by magnetism.
5. A magnet at rest lines up in what orientation?
6. Name the ends of a magnet.
7. Describe the interaction between: a) like poles b) opposite poles of two magnets.
8. Geographically, how are the poles of the Earth - magnet oriented?
9. How do some metals become temporary magnets?
10. What determines the polarity of the temporary magnet?
11. Is it possible to obtain a single magnetic pole, a monopole?
12. What metals are in many permanent magnets?
13. The presence of what is used to explain magnetic properties?
14. What term refers to the strength of a magnetic field?
15. What is the direction of a magnetic field around a bar magnet?
16. In general terms, why does a superconductor repel a magnet?
17. How does a temporary magnet affect a nearby magnetic field?
18. What Danish researcher investigated the connection between current and magnetism?
19. What is the shape of the magnetic field:
      a) around a straight conductor
      b) inside a loop of a coiled conductor
20. What is an electromagnet?
21. Name one use of an electromagnet associated with the recycling industry .
22. Magnetic tolls are useful when working with what type of metals?
23. What particles are in a magnetic domain?
24. How does the orientation of domains affect the magnetic properties of a piece of iron?
25. What is the physical appearance of the domains in the iron coating in a piece of recording tape?
26. What information comes from studying the domains in ancient rock samples?
27. What are the components of a loudspeaker?
28. Describe the operation of a loudspeaker.
29. What is the purpose of a galvanometer?
30. What are the components of a galvanometer?
31. What causes an electric motor to rotate?
32. What causes the Van Allen radiation belts around the earth?
33. Compare the orientation of the earth's Van Allen belts with that of its magnetic field. Refer to
      Fig. 24 - 21, p 504 and Fig. 24 - 27, p 508. Look carefully!