Electric field and Potential

# Electric field and Potential

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## Electric field and Potential

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1. Electric field and Potential Tutoring schedule

2. Recall the Electric Field?

3. Recall the Electric Field?

4. Field lines? Useful conceptualization of the electric field.

5. Field Lines:

6. Field Lines:

7. A field line always • Begins on a positive charge (or infinity) • Ends on a negative charge (or infinity)

8. Figuring field lines

9. Field Lines:

10. Field Lines: Big step!

11. Field Lines:

12. Field Lines: Big step!

13. Field Lines: Big steps give rough idea of field lines

14. Field Lines: Lot’s of little steps more accurate

15. A any point along a field line, the electric field points in the direction tangent to the line. But the field line by itself tells us nothing about the magnitude of E

16. Note: color Scheme is backward

17. Note: Electric field lines are not the path a test particle would follow Hockey demo again !! http://phet.colorado.edu/en/simulation/electric-hockey All they do is indicate the direction of the electric field (at any given point). But, you can get a little more info too …

18. Magnitude of electric field Is related to the spacing of adjacent lines The closer the spacing, the stronger the field

19. Electric Fields and conductors: Conductor ↔ charges free to move

20. Electric Fields and conductors: Conductor ↔ charges free to move + + + − + − + − + − − −

21. How it works:

22. How it works:

23. How it works:

24. How it works:

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26. How it works:

27. How it works:

28. How it works:

29. How it works:

30. How it works: Eventually …..

31. How it works: The mobile charges rearrange themselves until everywhere in the conductor

32. So in the static case : • Electric field is zero inside a conductor • No Net charge on the inside of a conductor • free charge must all be on surface • Electric field just outside the conductor must be perpendicular to the surface! • Magnitude of this Electric field is related to the density of charge on the surface at that point. (Gauss’s Law again)

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