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An electron with kinetic energy 4.0 keV moves horizontally into a region of space in which...

An electron with kinetic energy 4.0 keV moves horizontally into a region of space in which there is a downward-directed electric field of magnitude 14 kV/m.

(a) What are the magnitude and direction of the (smallest) magnetic field that will cause the electron to continue to move horizontally? Ignore the gravitational force, which is rather small.

______ (magnitude)

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