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If the vectors vecA=ahati+hatj-2hatk and...

If the vectors `vecA=ahati+hatj-2hatk` and `vecB=ahati-ahatj+hatk` are perpendicular to each other then the positve value of 'a' is

A

Zero

B

1

C

2

D

3

Text Solution

Verified by Experts

The correct Answer is:
C
`vecA.vecB=a^(2)-a-2=0,(a-2)(a+1)=0`
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