Vector Algebra Question 393
Question: If $ \mathbf{a}=2\mathbf{i}+4\mathbf{j}+2\mathbf{k} $ and $ \mathbf{b}=8\mathbf{i}-3\mathbf{j}+\lambda \mathbf{k} $ and $ \mathbf{a},\bot ,\mathbf{b}, $ then value of $ \lambda $ will be
[RPET 1995]
Options:
A) 2
B) ? 1
C) ? 2
D) 1
Show Answer
Answer:
Correct Answer: C
Solution:
- Clearly, $ 8\times 2-3\times 4+2\times \lambda =0\Rightarrow \lambda =-2. $
BETA
