If is the force acting on a particle having position vector and be the torque of this force about the origin, then-

Options

A. `vec t. vec tau gt 0 and vecf. Vectau lt 0`
B. `r. tau=0 and vecF.vectau=0`
C. `vecr.vectau=0 and vecF. Vecv ne0`
D. `vecr. Vectau ne0 and vecF. Vecr=0`

Answer

B

Explanation

`vectau=vecrxxvecF`
Torque is perpendicular `vecr` as well as force `vecF` Hence option (6) is correct.