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An electron beam passes through a region between two plates with a poten-
tial difference giving rise to an electric field of E = 10ª Vm-1. External coils give a magnetic
field of B = 10-4 T in this region, at right angles to the electric field and to the electron
beam. The electron beam is undeflected (follows a straight line) in this region. Calculate
the velocity of the electrons.

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