A uniform beam is pivoted at $P$ as illustrated. Weights of $10\,\text{N}$ and $20\,\text{N}$ are fixed to its two ends. The beam is labelled at $0.1\,\text{m}$ intervals. The beam itself weighs $100\,\text{N}$. At what point must an additional weight of $20\,\text{N}$ be attached so that the beam is in equilibrium?
- AA
- BB
- CC
- DD