. 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?

 capillary tube

Best Answer


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. 

Final Answer:

capillary tube

Hence, the correct option is A i.e., 


Talk to Our counsellor