The conditions of electrostatic equilibrium of conductor. E E=0 E (1)E=0 everywhere in the conductor; (2) El the surface of conductor outside the conductor.The conditions of electrostatic equilibrium of conductor: (2) E⊥ the surface of conductor outside the conductor.  (1) everywhere in the conductor; E = 0  e e e e e e e e E  E  E = 0 