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    Undergrad Electricity Formula: Difference between E=σ/2ε0 and E=σ/ε0

    Hi I want to know what is the diffrences between E=σ/2ε0 & E=σ/ε0 of course I know we use the first for a very huge page but what about the second formula? I saw in some solving of question when we have 2 pages infront of each others we use both of them... I want to understand the deep...