A charged particle moves undeflected through mutually perpendicular fields E and B. Which vector condition is required?
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A charged particle moves undeflected through mutually perpendicular fields E and B. Which vector condition is required?

G1 Physics · Accepted Answer

Zero Lorentz force requires q(E+v×B)=0. For perpendicular fields this selects both the magnitude v=E/B and the appropriate direction.