Let F→ be the force acting on a particle having position vector r→ and τ→ the torque of this force about the origin. Then

Correct option is 1r→⋅τ→=0 and F→⋅τ→=0

Questions

Let $\vec{F}$ be the force acting on a particle having position vector $\vec{r}$ and $\vec{τ}$ the torque of this force about the origin. Then

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r→⋅τ→=0 and F→⋅τ→=0

r→∙τ→=0 and F→∙τ→≠0

r→∙τ→≠0 and F→∙τ→=0

r→∙τ→≠0 and F→∙τ→≠0

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detailed solution

Correct option is A

We know that,τ→ = r→×F→ . So τ→ is perpendicular to both r→ and F→so, r→.τ→=0and F→.τ→=0

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