Question

The magnitude of a coplanar vector c such that a.C=b.C=a.B is given by :

Answer 1

Answer:

Correct option is

A

95

Let the vector C be xi^+yj^

A⋅B=(i^+j^)⋅(2i^−j^)=1

Given: A⋅C=B⋅C=A⋅B=1,

A.C=x+y=1 

x=2/3and y=1/3

Hence ∣C∣=94+91=