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Chapter 26 Electric Potential

Chapter 26 Electric Potential. 第二十六章 電位. Lightning. Just before lightning. Electric potential energy. Electric potential energy. where W is the work done by the static electric field. For convenience we often define.

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Chapter 26 Electric Potential

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  1. Chapter 26 Electric Potential 第二十六章 電位

  2. Lightning

  3. Just before lightning

  4. Electric potential energy

  5. Electric potential energy where W is the work done by the static electric field. For convenience we often define Where is the work done by the field to move the charge particle from infinity to its current position and .

  6. Electric potential In general we have

  7. Work done by an applied force If ΔK= 0, then

  8. Equipotential surfaces Surfaces in space on which V is constant.

  9. Equipotential surfaces If ΔV is chosen to be the same for all adjacent equipotential surfaces, then the electric filed is inversely proportional to the separations of the equipotential surfaces.

  10. Calculating the potential from the field or Vi can be assigned to any convenient value such as 0.

  11. Potential due to a point charge If

  12. Potential due to a point charge

  13. Potential due to an electric dipole P If the point of interest P is far away from the dipole, then

  14. Potential due to an electric dipole

  15. Induced dipole moment

  16. Potential due to a group of point charges Example

  17. Potential due to continuous charge distribution

  18. Line of charge

  19. Charged disk

  20. Calculating the field from the potential

  21. Electric potential energy of a system of point charges

  22. Potential of a charged isolated conductor

  23. Surface charge density of a conductor

  24. Electric fields near a conductor The field strength is strongest at the point on a conductor where its local curvature of radius is the smallest.

  25. Image charge

  26. Home work Question (問題): 8, 15, 21 Exercise (練習題): 5, 12, 19 Problem (習題): 12, 28, 29, 37

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