Fluid Mechanics

In a \(U\)-shaped tube the radius of one limb is 2 mm and that of other limb is 4 mm . A liquid of surface tension \(0.03 \mathrm{~Nm}^{-1}\), density \(1500 \mathrm{~kg} \mathrm{~m}^{-3}\) and angle of contact zero is taken in the tube. The difference in the heights of the levels of the liquid in the two limbs is
(Acceleration due to gravity \(=10 \mathrm{~ms}^{-2}\))