1.

Let vec(A) = (hat(i) + hat(j)) and, vec(B) = (2hat(i) - hat(j)). The magnitude of a coplanar vector vec(C) such that vec(A)vec(C) = vec(B)vec(C) = vec(A)vec(B), is given by :

Answer»

`sqrt((10)/(9))`
`sqrt((5)/(9))`
`sqrt((20)/(9))`
`sqrt((9)/(12))`

Answer :B


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