A) \[\overrightarrow{b}\times \overrightarrow{c}\]
B) \[\overrightarrow{a}\times \overrightarrow{b}\]
C) \[\overrightarrow{c}\]
D) \[\overrightarrow{a}\times \overrightarrow{c}\]
E) none of these
Correct Answer: A
Solution :
If\[\overrightarrow{a}\]is a unit vector perpendicular to\[\overrightarrow{b}\]and\[\overrightarrow{c}\]. \[\therefore \]\[-\overrightarrow{a}\]will be a second unit vector perpendicular to\[\overrightarrow{b}\]and\[\overrightarrow{c}\].
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