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Electric Potential

Electric Potential. Electric forces are conservative. Work done by an electric force is W=- q o Ed D U=-W. Figure 20-1 Change in Electric Potential Energy. Electric Potential. Definition of Electric Potential V. Electric Potential.

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Electric Potential

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  1. Electric Potential Electric forces are conservative. Work done by an electric force is W=-qoEd DU=-W

  2. Figure 20-1Change in Electric Potential Energy

  3. Electric Potential Definition of Electric Potential V

  4. Electric Potential When working with electric potential we measure only changes in electric potential. The zero point can be set arbitrarily.

  5. Figure 20-2Electric Field and Electric Potential

  6. Electric Potential Electric field and the rate of change of electric potential.

  7. Electric Potential Electric potential of point charges.

  8. Solve problems 1-7, 16-19, and 21-24 on pages 672 and 673.

  9. Electric fields around conductors Excess electric charges move to the surface of a conductor because that is where they are least affected by the internal charges of the material.

  10. Figure 19-18Charge Distribution on a Conducting Sphere

  11. Electric fields around conductors When electric charges are at rest, the electric field within a conductor is zero. This works even if the conductor has an internal cavity.

  12. Figure 19-19Electric Field Near a Conducting Surface

  13. Electric fields around conductors Electric field lines enter conductor surfaces at right angles.

  14. Figure 19-21Shielding Works in Only One Direction

  15. Figure 19-20Intense Electric Field Near a Sharp Point

  16. Electric fields around conductors Electric field lines are more intense near a sharp point.

  17. Charging by induction

  18. Figure 19-22abCharging by Induction

  19. Figure 19-22cdCharging by Induction

  20. Capacitors A capacitor is a device that has the ability “capacity” to store electric charge and energy.

  21. Capacitors

  22. Figure 20-13A Parallel-Plate Capacitor

  23. Capacitors

  24. Capacitors

  25. Capacitors A dielectric material is an insulator that increases the capacitance of a capacitor when placed between the plates. Each material has a dielectric constant k not to be confused with k.(p 665)

  26. Figure 20-15The Effect of a Dielectric on the Electric Field of a Capacitor

  27. Capacitors

  28. Capacitors

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