Undeflected Electron Beam in Crossed Fields
A beam of electrons with velocity v travels through a region with a uniform electric field E that is perpendicular to the beam’s path. What must be the magnitude and direction of a magnetic field B in the same region to allow the electrons to pass through undeflected?
A
B = Ev, perpendicular to both E and v
B
B = v/E, perpendicular to both E and v
C
B = E/v, parallel to E
D
B = E/v, perpendicular to both E and v
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