First slide

Surface tension

Question

A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is:

Moderate

A

5.0 g
B

10.0 g
C

20.0 g
D

2.5 g

Solution

$\begin{array}{l} Tcosθ \times 2 πr = mg \\ m α r \end{array}$
radius doubled mass doubled

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