Imagine an electric field E passing through a surface. Consider an infinitesimal area (dA) on that surface across which E remains constant. Also assume that the angle between E and dA is i. The electric flux is defined as EdAcos(i). E and dA are vectors. Flux is the dot product of E and dA. Using full vector notation, the electric flux formula_1 through a small area formula_2 is given by
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