A) angle between them is either zero or \[180{}^\circ \]
B) angle between them can have any value other than zero or \[180{}^\circ \]
C) angle between them is necessary \[90{}^\circ \]
D) angle between them can have any value other than \[90{}^\circ \]
Correct Answer: B
Solution :
As, \[F=q\left( v\,\,\times \,\,B \right)\,\,\Rightarrow \,\,F=q\,vB\,\,sin\theta \] At \[\theta =0{}^\circ ,\,\,F=0\] At \[\theta =90{}^\circ ,\,\,F=qvB\] At \[\theta =180{}^\circ , \,F=0\] So, for non-zero force angle between v and B can have any value other than zero or\[180{}^\circ \].
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