A capillary tube made of glass of radius 0.15 mm is dipped vertically in a beaker filled with methylene iodide (surface tension = 0.05 N m−1, density = 667 kg m−3) which rises to height h in the tube. It is observed that the two tangents drawn from liquid-glass interfaces (from opp. sides of the capillary) make an angle of 60∘ with one another. Then h is close to (g=10 m s−2).
a. 0.049 m
b. 0.087 m
c. 0.137 m
d. 0.172 m