An electron with kinetic energy 2.5 kev moves horizontally into a region of space in which there is a downward-directed uniform electric field of magnitude 10 kv/m.
(a) what are the magnitude and direction of the (smallest) uniform magnetic field that will cause the electron to continue to move horizontally? ignore the gravitational force, which is small.
(b) is it possible for a proton to pass through the combination of fields undeflected? if so, under what circumstances?
Answers: 3
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