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Let vecF be a force acting on a particle...

Let `vecF` be a force acting on a particle having positon vector `vecr. Let vectau` be the torque of this force about the origin then

A

`vecr.vectau gt 0` and `vecF.vectau lt 0`

B

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

C

`vecr.vectau=0` and `vecF.vectau ne0`

D

`vecr.vectau ne0` and `vecF.vectau=0`

Text Solution

Verified by Experts

The correct Answer is:
b
Torque is always perpendicular to `vecF` as well as `vecr`. `therefore vecr.vectau=0` as well as `vecF.vectau=0`.
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