The value of \[\lambda \] for which the vectors \[2\lambda \mathbf{i}+\mathbf{j}-\mathbf{k}\] and \[2\mathbf{j}+\mathbf{k}\] are perpendicular, is [MP PET 1992]

The value of \[\lambda \] for which the vectors \[2\lambda \mathbf{i}+

1.	The value of \[\lambda \] for which the vectors \[2\lambda \mathbf{i}+\mathbf{j}-\mathbf{k}\] and \[2\mathbf{j}+\mathbf{k}\] are perpendicular, is [MP PET 1992]
A.	None
B.	? 1
C.	1
D.	Any value
Answer» B. ? 1

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The value of \[\lambda \] for which the vectors \[2\lambda \mathbf{i}+\mathbf{j}-\mathbf{k}\] and \[2\mathbf{j}+\mathbf{k}\] are perpendicular, is [MP PET 1992]

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