Question

If A.B =AB then the angle between A and B is ?

Answer 1

`θ = 0^@`

Explanation:

Scalar product of two vectors `vec"A"` and `vec"B"` is given by

`vec"A" · vec"B" = |"A"||"B"| costheta`

It’s given that `vec"A" · vec"B" = |"A"||"B"|`

So,

`cancel(|"A"||"B"|) = cancel(|"A"||"B"|) costheta`

`costheta = 1`

`theta = cos^-1(1) = 0^@`