When `vec(A).vec(B)=-|A|.|B|` then :

Options

A. `vec(A)` and `vec(B)` are perpendicular to each other
B. `vec(A)` and `vec(B)` act in the same direction
C. `vec(A)` and `vec(B)` act in the opposite direction
D. `vec(A)` and `vec(B)` can act in any direction

Answer

C

Explanation

Here `Abcostheta=(|A|)(|B|)=-AB`
`costheta=-1, theta=180^@`
`vec(A)` and `vec(B)` are opposite to each other.