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Let vecF be the force acting on a parti...

Let `vecF` be the force acting on a particle having position vector `vecr and vecT` be the torque of this force about the origin. Then

A

`vecr*vec tau=0` and `vecF*vec tau ne 0`

B

`vecr*vec tau ""^(1) 0 and vecF*vec tau=0`

C

`vecr*vec tau gt 0 and vecF*vec tau lt 0`

D

`vecr*vec tau=0 and vecF*vec tau=0`

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