1. Basics in Magnetism Electromagnetism Force on a Current-Carrying Wire EM Induction Transformer Generators Electric Motors ELECTROMAGNETISM

2. The ABCs of Magnets  How was magnetism discovered?  What are the two poles of a magnet?  What materials do magnets attract?  How do magnets attract objects?  Is the earth a magnet?  What was first invented out of magnets?

3. How was magnetism discovered? Magnetite or lodestone

4. What are the two poles of a magnet? North and South Pole Magnetic Domains Like poles repel; opposite poles attract. Like poles repel; opposite poles attract.

5. What materials do magnets attract? nickel iron cobalt

6. “Magneto attracts Ironman.”

7. How do magnets attract object? Magnetic Field Region of space around a magnet that applies an attractive or repulsive force Region of space around a magnet that applies an attractive or repulsive force Direction is from North to South Magnetic Field Lines

8. 1 1 3 3 4 4 2 2 Drawing magnetic field lines Arrows are from North to South

9. Field lines of attraction Field lines of repulsion

12. Is the Earth a magnet? Magnetic South Pole Magnetic North Pole Auroras

13. What was first invented out of magnets? Compass 指南针

14. Making Magnets: Which makes better magnets? iron steel Magnetizes quickly Keeps magnetism longer Temporary magnets (electromagnets) Temporary magnets (electromagnets) Permanent magnets

15. Some uses of permanent magnets Fridge door tools locks