An electron travels through a region of space with noacceleration. Which one of

Question

An electron travels through a region of space with noacceleration. Which one of the following statements is the bestconclusion?

a. E andB might both be non-zero, but they must point inopposite directions.
b. E must be zero, butB might be non-zero in that region.
c. Both E andB must be zero in that region.
d. E andB might both be non-zero, but they must bemutually perpendicular.
e. B must be zero, but E mightbe non-zero in that region. An electron travels through a region of space with noacceleration. Which one of the following statements is the bestconclusion? E andB might both be non-zero, but they must point inopposite directions. E must be zero, butB might be non-zero in that region. Both E andB must be zero in that region. E andB might both be non-zero, but they must bemutually perpendicular. B must be zero, but E mightbe non-zero in that region.

Explanation / Answer

   Net force in electric and magnetic fieldis    F   =   e *E   +   B * e * v * sin    For F ( and hence acceleration) to be zero,E and must be be zero.

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