- Chapter 23. Electric Charge.
- Unit: Coulomb
- Unit: C/s=1 Amp (for current, I)
- Charges come in discrete pieces; electrons, protons.
- Ways to charge objects:
- rubbing
- conduction (contact with another charged object)
- induction (bring another charged object close)
- photoionization, chemical dissociation

- Coulomb's Law:
- E-field Definition:
- Rules of Electric field lines. (eg. never cross)
- Field due to point charge:
- Field above or below a Electric Dipole: (SKIP)
- Hints for finding E - Shell theorems.
- E-field outside of a spherically symmetric charge distribution is the same as the E-field of a point charge with the same total charge placed at the center
- E-field everywhere inside of a shell with a spherically symmetric charge distribution is 0.

- Field Due to Continuous Charge Distributions.
- Line charge, C/m.
- Surface charge, C/m.
- Volume charge, C/m.
- Find or or
- Find
- Use symmetry to see if some components of are 0.
- Integrate

- Chapter 24. Gauss' Law.
- Flux,
- .... the integral is over any closed (Gaussian) surface
- A gaussian surface is useful if:
- it is parallel and/or perpendicular to the E-field.
- E = 0 on the surface
- E is constant on the surface
- it intersects the point P where we want to find E

- Examples of E-fields we derived:
- Near a uniformly charged sheet/plane:
- Near a conducting plate with the charge density on
*both*sides: - Electric field outside spherical shell of total charge q:
- Electric field near a line of charge:

- Chapter 25. Electric Potential.
- Electric Potential Energy.
- Relative
- Absolute and
- Units: J

- Electric Potential, .
- Relative
- Absolute
- Units: J/C or Nm/C

- Finding Potential from .
- Finding from Potential.
- ; ;
- When is uniform,
- Example: checkpoint 6.

- Potential and Potential Energy Due to Point Charges
- Example: Question 3, 10.

- Potential due to continuous charge distributions
- Potential is constant inside of conductors

- Electric Potential Energy.