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jesuslovesu
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Homework Statement
In a velocity selector E and B fields are perpendicular. Which of the following conditions on the direction of the particle's velocity can result in no net force assuming the E and B are nonzero?
Homework Equations
F = Eq + q(vxB)
The Attempt at a Solution
The answer is B.
A) v is parallel to E
--Not sure why this wouldn't work. Since E is perpendicular to B why can't it result in F = 0? F = E + vB
B) v is parallel to (ExB)
--If I recall my cross product information correctly. v will be perpendicular to both E and B therefore I get F = E + vB.
What's the difference between the two?