1. Electric Potential Electric forces are conservative. Work done by an electric force is W=-q o Ed  U=-W

2. Figure 20-1 Change 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.  he zero point can be set arbitrarily.

5. Figure 20-2 Electric 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 19-18 Charge 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 19-19 Electric Field Near a Conducting Surface

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

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

15. Figure 19-20 Intense 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 19-22ab Charging by Induction

19. Figure 19-22cd Charging by Induction

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

21. Capacitors

22. Figure 20-13 A Parallel-Plate Capacitor

23. Capacitors

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

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

27. Capacitors