Example 2:

The inside diameters of the two arms of a U-tube are 1.0 mm and 1.5 mm respectively. Now if it is partially filled with water having surface tension of 0.0736 N/m and zero contact angle what will be the difference in the level of miniscii between the two arms.(shown in the figure below)

Given data:

        Diameter of the tubes 1.0 mm and 1.5 mm respectively

        Capillary rise in a tube

       For water contact angle 0_c = 0⁰    and Specific weight rg = 9810 N/m³

      Which gives h₁ = 30 mm when tube diameter is 1mm

     And h₂ = 20 mm when tube diameter is 1.5 mm.

Answer:     10mm.