A solid glass rod of radius $r$ is placed inside a glass cylinder of internal radius $R$. This glass rod is placed coaxially with the cylinder and in contact with the bottom of the cylinder and perpendicular to the surface of liquid of density $\rho$ in the glass cylinder. The height to which water will rise in the region between the rod and the cylinder due to surface tension is (the angle of contact is $0^\circ$ and surface tension is $T$)