Sunday, 2 August 2015

electrostatics - Why are excess charges in a conductor at the surface?


I’ve been told that coulomb repulsion pushes excess electrons to the surface of a conductor (i.e. sphere) electrostatic equilibrium, and this symmetry causes the net electric field inside to be zero. However, why can’t excess charges just be evenly distributed throughout the sphere? Would that symmetry not cancel the fields from each charge?


It would be helpful if anyone can provide a diagrammatic answer.




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