Electric flux

1
Electric flux

• Electric Flux - ?E N/C m2

2
Electric flux diagram

• Here is one with an angle ? at surface

3
Gauss Law
4
Gauss Law

• Note that since all surfaces have same enclosed
  charge q, ?1 ?2 ?3

5
Example of Gauss Law

• FLUX Net Charge Enclosed By Surface
• SEE ACTIVE FIGURE 24.9 at pse6.com

6
Gauss Law Sphere
7
Gauss Law Sphere

• Charged shell, outside and inside

8
Summary of sphere/cylinder
9
Gauss Law Cylinder
10
Application Insulators - Ex. 24.8
Calculate E due to an infinite plane of charge
density ?
11
Electric Field just outside charged conductor
12
The following properties apply to all conductors
in electrostatic equilibrium

• E is everywhere 0 inside the conductor.
• if the conductor is charged, all the charge is on
  the surface (outside).
• magnitude of E outside is ?/?o (E inside is 0).
• direction of E outside is ? to the surface.
• the density of E is greatest at the sharp points
• of the surface, i.e., where the radius of
  curvature is smallest.

13
Arbitrarily shaped conductor

• (1) E inside 0 (2) E outside is perpendicular
  to surface (3) E strongest at points

14
Link to return to phy2049 homepage
Link here