Physics - Rotation Question with Solution | TestHub

In the diagram shown the rod is rigid and massless. A constant force $\mathrm{F}=\mathrm{mg}$ has been applied vertically downwards on the rod. The wall and the horizontal surface are perfectly smooth. Assume no relative motion to be present between the lower contact point of the rod and the upper surface of the block. If the minimum value of co-efficient of friction between the blocks such that initially no relative motion occurs between the blocks, is equal to $\frac{1}{\alpha }$ then find the value of $\alpha$.The initial value of the angle $\theta$ is equal to 45°.