If a = i + j - 3 k b = 3 i - j + 2 k if a b are perpendicular then

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Solution

Q.
If $\vec{a} = \hat{i} + λ \hat{j} - 3 \hat{k},$ $\vec{b} = 3 \hat{i} - \hat{j} + 2 \hat{k}$ if $\vec{a}, \vec{b}$ are perpendicular then $| λ |$ =

Ans.
(3)

$\vec{a} \cdot \vec{b} = 0$

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