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If vecA+vecB is a unit vector along x-a...

If ` vecA+vecB` is a unit vector along x-axis and `vecA = hati-hatj+hatk`, then what is `vecB` ?

A

`hati+hatk`

B

`hatj-hatk`

C

`hati+hatj+hatk`

D

`hati+hatj-hatk`

Text Solution

Verified by Experts

The correct Answer is:
2
`vecA+vecB= hati rArr vecB =hati-vecA= hati- (hati-hatj+hatk)=hatj-hatk`
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