Physics - Rotation Question with Solution | TestHub

The position vector of a particle of mass $m$ moving with a constant velocity $\vec{v}$ is given by $\vec{r}=x(t)\hat{i}+b\hat{j}$, where $b$ is a constant. At an instant, $\vec{r}$ makes an angle $\theta$ with the $x$-axis as shown in the figure. The variation of the angular momentum of the particle about the origin with $\theta$ will be