If a=2 i+j-k is perpendicular to b = i -4 j - k , then is equal t… - Vidyadip

MCQ

If $\bar{a}=2 \hat{i}+\hat{j}-\hat{k}$ is perpendicular to $\overline{ b }=\hat{ i }-4 \hat{ j }-\lambda \hat{ k }$, then $\lambda$ is equal to

A
$0$
B
$-1$
C
2
D
$-3$

✓

Answer

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