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Chapter 24 Capacitance, dielectrics and electric energy storage

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**1. **Chapter 24 Capacitance, dielectrics and electric energy storage Basic circuit devices
Resistors
Capacitors
Inductors
Power supply (Battery, Generator)
Use our knowledge of electric fields, potentials, and energy to describe how capacitors work.

**2. **Parallel Plate Capacitor

**3. **Active Figure 26.4 (b) When the switch is closed, the battery establishes an electric field in the wire that causes electrons to move from the left plate into the wire and into the right plate from the wire. As a result, a separation of charge exists on the plates, which represents an increase in electric potential energy of the system of the circuit. This energy in the system has been transformed from chemical energy in the battery.
Active Figure 26.4 (b) When the switch is closed, the battery establishes an electric field in the wire that causes electrons to move from the left plate into the wire and into the right plate from the wire. As a result, a separation of charge exists on the plates, which represents an increase in electric potential energy of the system of the circuit. This energy in the system has been transformed from chemical energy in the battery.

**5. **Potential difference and electric fields in a uniform electric field

**6. **Potential difference and electric fields in a uniform electric field

**7. **Factors affecting capacitance Size of the capacitor (A, d)
Geometric arrangement
Plates
Cylinders
Material between conductors
Air
Paper
Wax

**8. **Units of capacitance

**9. **Capacitance – Isolated Sphere Assume a spherical charged conductor
Assume V = 0 at infinity
Note, this is independent of the charge and the potential difference

**10. **Cylindrical capacitor

**11. **Capacitance of a cylindrical capacitor

**12. **Example How strong is the electric field between the plates of a 0.80 mF air gap capacitor if they are 2.0 mm apart and each has a charge of 72 mC?

**13. **Capacitors in Parallel

**14. **Capacitors in Series

**15. **Capacitor circuit example

**16. **Energy Storage in Capacitors

**17. **Alternate Energy Expressions

**18. **Energy Density

**19. **Dielectrics

**20. **Dielectrics

**21. **Example values of dielectric constant

**22. **Effect of a dielectric on capacitance

**23. **Effect of the dielectric constant

**24. **Example – Parallel Plate Capacitor

**25. **Dipoles

**26. **Dipoles in a Uniform Electric Field

**27. **Work Rotating a Dipole in an Uniform Electric Field

**28. **Example P26.9

**29. **Example P26.21

**30. **Example P26.27

**31. **Example P26.35

**32. **Example P26.43

**33. **Example P26.59