Question

If ⃗ ⃗ ⃗ ⃗ , then angle between and ⃗ is

(a) 1800

(b) 900

(c) 600​

Answer 1

The angle between A and B is 180° or π

A×B = -B×A (1)

A× B = B × A (given)

We know,

A × B = ABsinθ

and

B × A = BAsin(2π-θ)= -BAsinθ

from eqn (1)

θ=π= 180°