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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 vecr` be the torque of this force about the origin then

A

`bar.bar tau=0` and `barF. Bar tau=0`

B

`bar.bar tau=0` and `barF. Bar taune0`

C

`bar.bar taune0` and `barF. Bar tau=0`

D

`bar.bar taune0` and `barF. Bar taune0`

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The correct Answer is:
A
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