A uniform beam is pivoted at $P$ as shown. A $10\,\text{N}$ weight and a $20\,\text{N}$ weight are fixed to the two ends. The beam is graduated in $0.1\,\text{m}$ intervals. The beam itself has a weight of $100\,\text{N}$. At which point should an additional $20\,\text{N}$ weight be placed so that the beam is in equilibrium?
- AA
- BB
- CC
- DD