A thin horizontal disc is rotating about a vertical axis passing through its fixed centre O. Its angular momentum is L A and L B computed about…

A thin horizontal disc is rotating about a vertical axis passing through its fixed centre $\displaystyle O$. Its angular momentum is $\displaystyle \mathrm{L}_A$ and $\displaystyle \mathrm{L}_B$ computed about points $\displaystyle A$ and $\displaystyle B$, respectively, with $\displaystyle O B=2 \times O A$. The value of $\displaystyle \frac{\mathrm{L}_A}{\mathrm{~L}_B}$ is :