1. electrostatic equilibrium
   1. E(inside)=0
   2. charge resides on the surface
   3. field magnitude and direction
   4. charge density highest at sharp pints
2. gauss's law
   1. the relationship of E and A with electric flux
   2. the situation of the closed surface
   3. different conditions
      1. a point charge
      2. spherically symmetrical charge distribution
      3. from a line of charge
      4. the plane of charge
3. electric flux
   1. proportional to No. of lines
   2. =E * A
   3. through the closed surface