Vector Algebra Question 382
Question: The vector $ 2,\mathbf{i}+\mathbf{j}-\mathbf{k} $ is perpendicular to $ \mathbf{i}-4\mathbf{j}+\lambda \mathbf{k}, $ if $ \lambda = $
[MNR 1983; MP PET 1988]
Options:
A) 0
B) ? 1
C) ? 2
D) ? 3
Show Answer
Answer:
Correct Answer: C
Solution:
- $ \mathbf{a}.\mathbf{b}=(2-4-\lambda )=0\Rightarrow \lambda =-2. $
BETA
