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What should be added in vector a=3hati+4...

What should be added in vector `a=3hati+4hatj-2hatk` to get its resultant a unit vector `hati`?

A

`-2hati-4hatj+2hatk`

B

`-2hati+4hatj-2hatk`

C

`2hati+4hatj-2hatk`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
Let b should be added, then `a+b=hati`
`impliesb=hati-a=hati-(3hati+4hatj-2hatk)`
`=-2hati-4hatj+2hatk`
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