An Electron Enters the Region Between Two Plates Traveling Along

An electron enters the region between two plates traveling along the x-direction with a speed of v = 4.78 * 10⁶ m/s.Both plates are parallel to the x-y plane and are separated by 4.5 cm.The potential of the top plate at z = 4.5 cm is +100 V while the potential of the bottom plate at z = 0 cm is 0 V.What is the direction of the magnetic field between the plates that is required so that the electron continues traveling in a straight line along the x-direction in this region?

A) positive y-direction
B) negative y-direction
C) positive z-direction
D) negative z-direction
E) positive x-direction

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