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The vector hati + hatj + 3 hatk is rota...

The vector `hati + hatj + 3 hatk ` is rotated through an angle `theta` and is doubled in magnitude, then it becomes `4 hati + (4x -2 ) hatj + 2hatk.` The value of x is :

A

`- (2)/(3) , 2`

B

`(1)/(3), 2`

C

`(2)/(3) ,0`

D

`2,7.`

Text Solution

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The correct Answer is:
A
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