Let a = hati - 2 hatj + 3 hatk , If b...

Let a ` = hati - 2 hatj + 3 hatk , ` If b is a vector such that `a.b =|b| ^(2) and |a - b | = sqrt7,` then |b| is equal to
a)`sqrt7` b)`sqrt3` c)7 d)3

A

`sqrt7`

B

`sqrt3`

C

7

D

3

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The correct Answer is:

A

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