. A capillary tube (A) is dipped in water
Another identical tube (B) is dipped in a soap - water solution. Which of the following shows the relative nature of the liquid columns in the two tubes?
The balancing pressure in the capillary tube is
2 σ / r = hpg
∴ h ∝ σ
On mixing the soap, the surface tension of the water decreases due to which the height of the water rises.
Moreover the shape of the water with the glass tube formed at the top level is convex.
Hence, the correct option is A i.e.,