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The value of $\lambda$ for which two vectors $2\hat{i}-\hat{j}+2\hat{k}$ and $3\hat{i}+\lambda\hat{j}+\hat{k}$ are perpendicular is |
2 4 6 8 |
8 |
The correct answer is Option (4) → 8 ## Dot product of two mutually perpendicular vectors is zero. $\Rightarrow 2 \times 3 + (-1)\lambda + 2 \times 1 = 0$ $\Rightarrow \lambda = 8$ |
