Vector Algebra Question 340
Question: If $ |a|,=,|\mathbf{b}|, $ then $ (a+b),.,(a-b) $ is
[MP PET 2002]
Options:
A) Positive
B) Negative
C) Zero
D) None of these
Show Answer
Answer:
Correct Answer: C
Solution:
- $ (a+b),.,(a-b)=a.a+b.a-b.a-b.b $ $ =a.a-b.b=,|a{{|}^{2}}-|b{{|}^{2}} $ $ =0 $ , $ (\because ,|\mathbf{a}|,=,|\mathbf{b}|) $ .
BETA
