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Which of the followingis a unit vector ?...

Which of the followingis a unit vector ?

A

`hati+hatj`

B

`costheta hati-sin thetahatj`

C

`sinthetahati +2costheta hatj`

D

`(1)/(sqrt(3))(hati+ hatj)`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Unit vector has a magnitude equal to 1.
Here ,`sqrt(cos^(2)theta+sin^(2)theta)=1`
` therefore` Opition (b ) is the correct answer.
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