Electric field and Potential - PowerPoint PPT Presentation

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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:

  25. How it works:

  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)

  33. Van de Graff again:

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