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Suppose you have an infinite thin sheet of charge with a certain charge density. By symmetry we know the electric field is perpendicular to the sheet. You can calculate the field using this method: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elesht.html $E = \dfrac{\sigma}{2\epsilon_0}$ This field is constant everywhere. If we have a second sheet ...



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