Home Physics Surface Tension JEE (Advanced) / IIT-JEE Problems (Previous Years) A uniform capillary tube of inner radius r i…
Physics Surface Tension JEE (Advanced) / IIT-JEE Problems (Previous Years) MCQ (Single Correct)

A uniform capillary tube of inner radius r is dipped vertically into a beaker filled with water. The water rises to a height h in the capillary tube above the water surface in the beaker. The surface tension of water is σ . The angle of contact between water and the wall of the capillary tube is θ . Ignore the mass of water in the meniscus. Which of the following statements is (are) true?

A
For a given material of the capillary tube, h decreases with increase in r
B
For a given material of the capillary tube, h is independent of σ
C
If this experiment is performed in a lift going up with a constant acceleration, then h decreases
D
h is proportional to contact angle θ

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The correct answer is:
CHECK THE SOLUTION.

(a, c)

Sol. h =

When lift is going up with constant acceleration

h =

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