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Given two vectors are hati-hatj and hati...

Given two vectors are `hati-hatj and hati+2hatj`. The unit vector coplanar with the two vectors nad perpendicular to first is (A) `1/sqrt(2)(hati+hatj)` (B) `1/sqrt(5)(2hati+hatj)` (C) `+-1/sqrt(2)(hati+hatj)` (D) none of these

A

`(1)/(sqrt(2))(hati + hatk)`

B

`(1)/(sqrt(5))(2hati + hatj)`

C

`pm (1)/(sqrt(2))(hati + hatj)`

D

None of these

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The correct Answer is:
c
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