1. 22-1 Physics I Class 22 The Magnetic Field

2. 22-2 Magnetism in Ancient Times

3. 22-3 Peter Peregrinus

4. 22-4 William Gilbert

5. 22-5 Some Old (and Debunked) Ideas Linger On

6. 22-6 Magnetic Forces Between Poles “Opposites Attract”

7. 22-7 Why Is A Magnet Attracted to Some Materials (Refrigerators)?

8. 22-8 What Happens If You Try to Separate North and South Poles?

9. 22-9 Magnetic Field Lines

10. 22-10 Electromagnetism

11. 22-11 Units of Magnetic Field

12. 22-12 Class #22 Take-Away Concepts

13. 22-13 Class #22 Problems of the Day

14. 22-14 Class #22 Problems of the Day

15. 22-15 Activity #22 Introduction to Magnetic Fields

16. 22-16 Chinese Voyages of Exploration Admiral Zheng He (1371-1435)