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Transcript
Magnetism and Induction Review
1. How will a magnet that is free to rotate, like a compass, align itself with earth’s magnetic field?
2. How do opposite poles affect each other? What about like poles?
3. What do you get when you break a magnet in half?
4. Can you ever make it small enough to get just one magnetic pole?
5. What is the source of magnetic fields?
6. What are magnetic domains?
7. Where is the magnetic pole in the northern hemisphere? Is it in the same place as the
geographic pole? What type of magnetic pole is it?
8. What is the commonly accepted theory for the source of earth’s magnetic field?
9. Has the earth’s magnetic field always been the same as it is now? How has it changed?
10. Which direction are magnetic field lines drawn? (Which way do the arrows point?)
11. What conditions are necessary for induction to occur?
12. How is the number of turns in a coil related to the induced voltage?
13. What does a generator consist of?
14. What does a motor consist of?
15. What is the function of a generator?
16. What is the function of a motor?
17. What is the function of the commutator in the motor?
18. What is a transformer?
19. What is the relationship between primary & secondary turns and voltages?
20. Ignoring energy losses due to heating of the coils, how do secondary and primary power
compare? What about energy? What about currents?
21. Is secondary voltage higher or lower than primary voltage in a step-up transformer?
22. Why do power companies transmit energy as ac rather than dc?
23. What is the smallest known magnet?
24. What is a galvanometer?
25. A changing magnetic field creates a ____________________ field and a changing electric field
creates a ___________________________ field