If vecF is the force acting on a particle having position vector vecr and vectau be the torque of this force about the region, then :

If vecF is the force acting on a particle having position vector vecr

1.	If vecF is the force acting on a particle having position vector vecr and vectau be the torque of this force about the region, then :
Answer» `vecr.vectaugt0 and vecF.vectault0` `vecr.vectau=0 and vecF.vectau=0` `vecr.vectau=0 and vecF.vectaune0` `vecr.vectaune0 and vecF.vectau=0` Solution :`vecr and vecF` are in the same PLANE, while `vectau` is PERPENDICULAR to the plane form by `vecr and vecF` Hence, DOT PRODUCT of `vecr and vecF` of `vectau` (solar produce) is always zero