A charged particle is projected with non-zero velocity into a region of uniform

Question

A charged particle is projected with non-zero velocity into a region of uniform non-zero E and B fields which are perpendicular to each other. Given that the total force on the particle is not zero and that you do not know the direction of the particle's initial velocity, which statement below is true?

A. The total force on the particle cannot be perpendicular to both E and B
B. The total force on the particle cannot be parallel to E.
C. The total force on the particle will always be zero for any values of E and B.
D. The total force on the particle cannot be parallel to B
E. None of the above.

Explanation / Answer

D. The total force on the particle cannot be parallel to B

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