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seeking a basic electricity course - complete with examples worked out. See
Table of Contents.
¶ U.S. GOVERNMENT PRINTING OFFICE; 1945 - 618779
CHAPTER 11 QUIZ
1. All magnets have at least _____________ poles.
2. Describe two methods of producing an artificial magnet.
3. What two things does a vector show about a force?
4. What are the three important facts about a magnetic field?
5. Like magnetic poles _____________ each other.
6. Unlike magnetic poles _____________ each other.
7. Flux can choose either an air or an iron path. Which does it use?
8. Where does a compass point true north?
9. What is variation?
10. About how much variation would a compass have if it were located at the mouth of
the Mississippi River?
11. What is deviation?
12. If you should break an ordinary magnet into 5 pieces, how many poles would you have?
13. A piece of iron has magnetic lines passing through it. A pattern of its field with iron
filings shows that many of the lines do not go through the iron - instead they pass
through the, air. Why?
14. Permanent magnets have a high _____________.
Return to Chapter 11
CHAPTER 11 ANSWERS
2. (1) Stroke unmagnetized iron against a magnet. (2) W rap iron in a coil of wire and pass
a current through the coil.
3. Direction and strength.
4. (1) No lines cross. (2) All lines are complete. (3) All lines leave the magnet at right angles
to the magnet surface.
7. Always the iron.
8. Anywhere on the Agonic line.
9. The error introduced in a compass reading due to the different locations of the
magnetic and geographic poles.
10. About 5 degrees.
11. The error introduced in a compass reading due to magnetic influences aboard the
ship or plane.
13. This iron is saturated-it is holding all the lines it can.
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