Physics · 2009
NEET 2009 · Prelims · Code A · Q11
If F is the force acting on a particle having position vector r and τ be the torque of this force about the origin, then:
If $\displaystyle \overrightarrow{\mathrm{F}}$ is the force acting on a particle having position vector $\displaystyle \vec{r}$ and $\displaystyle \vec{\tau}$ be the torque of this force about the origin, then :
Official answer
(4)
$\displaystyle \overrightarrow{\mathrm{r}} \cdot \vec{\tau}=0$ and $\displaystyle \overrightarrow{\mathrm{F}} \cdot \vec{\tau}=0$.
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NEET (UG) 2009 Physics question, with the answer from NTA’s final answer key. Where our answers come from.