1.

Let vecF be the force acting on a particle having position vector vecr and vec(tau) be the torque of this force about the origin. Then

Answer»

`VECR.vec(TAU)ne0 and vecF.vec(tau)ne0`
`vecr.vec(tau)=ne0 and vecF.vec(tau)=0`
`vecr.vec(tau)=ne0 and vecF.vec(tau)ne0`
`vecr.vec(tau)=0 and vecF.vec(tau)=0`

Solution :Torque `vec(tau)=vecr xx vecF`
`vec(tau)" is PERPENDICULAR to "vecr. THEREFORE vec(tau) .vecr=0 or vecr.vec(tau)=0`
`vec(tau)" is perpendicular to "vecF. therefore vec(tau) .vecF=0 or vecF.vec(tau)=0`


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