A capillary tube made of glass of radius 0.15 mm is dipped vertically in a beaker…

PHYSICS · Single correct · CBSE · Physics · Mechanical Properties of Fluids · Mechanical Properties of Fluids

Problem

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 \text{ N m}^{-1}

, density =

667 \text{ 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^\circ

with one another. Then

h

is close to (

g = 10 \text{ m s}^{-2}

). (1) 0.049 m (2) 0.087 m (3) 0.137 m (4) 0.172 m