Published by:
CGP EDU Academic Team
Published on: September 12, 2026
Two long capillary tubes A and B of radius R B >R A dipped in same liquid. Then
Text Solution
Verified by ExpertsThe correct answer is:
A
Step 1: Understand capillarity. The height to which a liquid rises in a capillary tube is given by the formula:
$$ h = \frac{2\gamma \cos\theta}{\rho g r} $$
where:
- $h$ is the height of the liquid column,
- $\gamma$ is the surface tension of the liquid,
- $\theta$ is the contact angle,
- $\rho$ is the density of the liquid,
- $g$ is the acceleration due to gravity,
- $r$ is the radius of the capillary tube.
Step 2: Compare the two capillary tubes. Since both tubes A and B are dipped in the same liquid and have the same surface tension, density, and contact angle, the significant difference is the radius.
Step 3: Analyze the equation. As the radius $r$ increases, the height $h$ of the liquid column decreases. Thus, the smaller the radius, the higher the rise of liquid in the capillary tube.
Step 4: Since RA < RB, it follows that the liquid will rise higher in tube A compared to tube B.
Therefore, the correct answer is Option A: Water rises more in A than B.
$$ h = \frac{2\gamma \cos\theta}{\rho g r} $$
where:
- $h$ is the height of the liquid column,
- $\gamma$ is the surface tension of the liquid,
- $\theta$ is the contact angle,
- $\rho$ is the density of the liquid,
- $g$ is the acceleration due to gravity,
- $r$ is the radius of the capillary tube.
Step 2: Compare the two capillary tubes. Since both tubes A and B are dipped in the same liquid and have the same surface tension, density, and contact angle, the significant difference is the radius.
Step 3: Analyze the equation. As the radius $r$ increases, the height $h$ of the liquid column decreases. Thus, the smaller the radius, the higher the rise of liquid in the capillary tube.
Step 4: Since RA < RB, it follows that the liquid will rise higher in tube A compared to tube B.
Therefore, the correct answer is Option A: Water rises more in A than B.
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
When two capillary tubes of different diameters are dipped vertically, the rise of the liquid is
Due to capillary action, a liquid will rise in a tube, if the angle of contact is
In the state of weightlessness, a capillary tube is dipped in water, then water
Two parallel glass plates are dipped partly in the liquid of density 'd' keeping them vertical. If …
Water rises in a capillary tube to a certain height such that the upward force due to surface tensi…
It is not possible to write directly on blotting paper or newspaper with ink pen