Equation 3-3 suggests how a velocity selector for particles or mixtures of different particles all having the same charge can be made. Suppose you wish to make a velocity selector that allows undeflected passage for electrons whose kinetic energy is 5.0 x 10⁴ eV. The electric field available to you is 2.0 x 10⁵ V/m. What magnetic field will be needed?

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quB = q& or U 80 | B 3-3