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A velocity selector consists of electric and magnetic fields described by the expressions E = Ek and B = Bj, with B = 15.0 mT.

A velocity selector consists of electric and magnetic fields described by the expressions E = Ek and B = Bj, with B = 15.0 mT. Find the value of E such that a 750-eV electron moving in the negative x direction is undeflected

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