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vec(P)+vec(Q) is a unit vector along x-a...

`vec(P)+vec(Q)` is a unit vector along x-axis. If `vec(P)= hat(i)-hat(j)+hat(k)`, then what is `vec(Q)`?

A

`hati+hatj-hatk`

B

`hatj-hatk`

C

`hati+hatj+hatk`

D

`hatj+hatk`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Given ,`P=hati-hatj+hatk`
and `P+Q=hatiimpliesQ=hati-hati+hatj+hatk=hatj-hatk`
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