A capillary tube (I) is dipped in water. Another identical tube (II) is dipped in a soap-water solution. Which of the following shows the relative nature of the liquid columns in the two tubes?

Question

A capillary tube (I) is dipped in water. Another identical tube (II) is dipped in a soap-water solution. Which of the following shows the relative nature of the liquid columns in the two tubes? (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Surface tension of soap solution is less than that of water
As

h = \frac{2 S cos θ}{r ρ g}

or

h \propto S

Therefore, the height of liquid raised in the capillary tube is less for soap solution and more for pure water. Hence option is correct

Q. A capillary tube (I) is dipped in water. Another identical tube (II) is dipped in a soap-water solution. Which of the following shows the relative nature of the liquid columns in the two tubes?

Surface tension of soap solution is less than that of water As h=rρg2Scosθ​ or h∝S Therefore, the height of liquid raised in the capillary tube is less for soap solution and more for pure water. Hence option is correct

Surface tension of soap solution is less than that of water
As $h = \frac{2 S cos θ}{r ρ g}$ or $h \propto S$
Therefore, the height of liquid raised in the capillary tube is less for soap solution and more for pure water. Hence option is correct