A) Always zero
B) Never zero
C) Zero, if \[\overrightarrow{B}\] and \[\overrightarrow{v\,}\] are perpendicular
D) Zero, if \[\overrightarrow{B}\] and \[\overrightarrow{v\,}\] are parallel
Correct Answer: D
Solution :
\[\overrightarrow{F}=q(\overrightarrow{v}\times \overrightarrow{B})\]; if \[\overrightarrow{v}||\,\overrightarrow{B}\] then \[\overrightarrow{F}=0\]
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