1.

Let vecF be the force acting on a particle having position vector vecrandvectau be the torque of this force about the origin. Then :

Answer»

`vecr.vectau=0 and vecF.vectau=0`
`vecr.vectau=0 and vecF.vectau=0`
`vecr.vectaune0 and vecF.vectau=0`
`vecr.vectaune0 and vecF.vectaune0`

Solution :Here `vectau=vecFxxvecr`
Now, `vecr.vectau=vecr.(vecFxxvecr)=R(FR)COS90^(@)`= Zero.
Similarly `vecF.vectau` = zero


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