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

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Presentation on theme: "Electric Potential Electric forces are conservative. Work done by an electric force is W=-q o Ed  U=-W."— Presentation transcript:

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

2 Electric Potential The convention in our text is that the work done on a system is has a negative sign. Unfortunately the college board help sheets use the opposite convention.

3 Figure 20-1 Change in Electric Potential Energy

4 Electric Potential Definition of Electric Potential V

5 Electric Potential When working with electric potential we measure only changes in electric potential.  he zero point can be set arbitrarily.

6 Figure 20-2 Electric Field and Electric Potential

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

8 Electric Potential Electric potential of point charges.

9 Electric potential Equipotentials are surfaces where the electric potential is the same.

10 Figure 20-6 Equipotentials for a Point Charge

11 Figure 20-7 Equipotential Surfaces for a Uniform Electrical Field

12 Figure 20-8 Equipotential Surfaces for Two Point Charges

13 Solve problems 1-7, 16-19, and on pages 672 and 673.

14 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.

15 Figure Charge Distribution on a Conducting Sphere

16 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.

17 Figure Electric Field Near a Conducting Surface

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

19 Figure Shielding Works in Only One Direction

20 Figure Intense Electric Field Near a Sharp Point

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

22 Charging by induction

23 Figure 19-22ab Charging by Induction

24 Figure 19-22cd Charging by Induction

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

26 Capacitors

27 Figure A Parallel-Plate Capacitor

28 Capacitors

29

30 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)

31 Figure The Effect of a Dielectric on the Electric Field of a Capacitor

32 Capacitors

33


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