If \[\mathbf{a}=\mathbf{i}-2\mathbf{j}+3\mathbf{k}\] and \[\mathbf{b}=3\mathbf{i}+\mathbf{j}+2\mathbf{k},\] then the unit vector perpendicular to a and b is [MP PET 1996]

\[\frac{\mathbf{i}-\mathbf{j}-\mathbf{k}}{\sqrt{3}}\]

\[\frac{\mathbf{i}+\mathbf{j}+\mathbf{k}}{\sqrt{3}}\]

\[\frac{\mathbf{i}-\mathbf{j}+\mathbf{k}}{\sqrt{3}}\]

\[\frac{-\mathbf{i}+\mathbf{j}+\mathbf{k}}{\sqrt{3}}\]

\[\frac{\mathbf{i}-\mathbf{j}-\mathbf{k}}{\sqrt{3}}\]

If \[\mathbf{a}=\mathbf{i}-2\mathbf{j}+3\mathbf{k}\] and \[\mathbf{b}=

1.	If \[\mathbf{a}=\mathbf{i}-2\mathbf{j}+3\mathbf{k}\] and \[\mathbf{b}=3\mathbf{i}+\mathbf{j}+2\mathbf{k},\] then the unit vector perpendicular to a and b is [MP PET 1996]
A.	\[\frac{\mathbf{i}+\mathbf{j}+\mathbf{k}}{\sqrt{3}}\]
B.	\[\frac{\mathbf{i}-\mathbf{j}+\mathbf{k}}{\sqrt{3}}\]
C.	\[\frac{-\mathbf{i}+\mathbf{j}+\mathbf{k}}{\sqrt{3}}\]
D.	\[\frac{\mathbf{i}-\mathbf{j}-\mathbf{k}}{\sqrt{3}}\]
Answer» D. \[\frac{\mathbf{i}-\mathbf{j}-\mathbf{k}}{\sqrt{3}}\]

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If \[\mathbf{a}=\mathbf{i}-2\mathbf{j}+3\mathbf{k}\] and \[\mathbf{b}=3\mathbf{i}+\mathbf{j}+2\mathbf{k},\] then the unit vector perpendicular to a and b is [MP PET 1996]

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