Forces and equilibrium — practice question

A ring with mass $0.2\,\text{kg}$ is placed on a fixed rough horizontal rod, and a light inextensible string is fixed to the ring at an angle $\alpha$ above the horizontal, where $\cos\alpha = 0.96$. The ring is in limiting equilibrium, and the tension in the string is $T\,\text{N}$ (see diagram). The coefficient of friction between the ring and the rod is $0.25$.