Find unit vector perpendicular to $\vec A$ and $\vec B$ where $\vec A = \hat i - 2\hat j + \hat k$ and $\vec B = \hat i + 2\hat j$
Find unit vector perpendicular to $\vec A$ and $\vec B$ where $\vec A = \hat i - 2\hat j + \hat k$ and $\vec B = \hat i + 2\hat j$
- A
$\frac{{2\hat i + \hat j + 4\hat k}}{{\sqrt {21} }}$
- B
$\frac{{ - 2\hat i + \hat j + 4\hat k}}{{\sqrt {21} }}$
- C
$\frac{{ - 2\hat i - \hat j + 4\hat k}}{{\sqrt {21} }}$
- D
$\frac{{2\hat i + \hat j + 4\hat k}}{{\sqrt 5 }}$
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- [JEE MAIN 2015]
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