The vector \[\overrightarrow{P}=a\hat{i}+a\hat{j}+3\hat{k}\] and \[\ov – McqOptions

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1.	The vector \[\overrightarrow{P}=a\hat{i}+a\hat{j}+3\hat{k}\] and \[\overrightarrow{Q}=a\hat{i}-2\hat{j}-\hat{k}\] are perpendicular to each other. The positive value of a is [AFMC 2000; AIIMS 2002]
A.	3
B.	4
C.	9
D.	13
Answer» B. 4

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