Q. 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 ?
A) [image:10_image47.jpeg]
B) [image:10_image48.jpeg]
C) [image:10_image49.jpeg]
D) [image:10_image50.jpeg]
Explanation
(c) Soap solution has lower surface tension, T as compared to pure water and capillary rise $h = \frac{2T\cos\theta}{\rho rg},$ so $h$ is less for soap solution.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.