First slide

Surface tension and surface energy

Question

Two capillary tubes P and Q are dipped in water. The height of water level in capillary P is 2/3 to the height in Q capillary. The ratio of their diameters is

Moderate

A

2 : 3
B

3 : 2
C

3 : 4
D

4 : 3

Solution

$r \propto \frac{1}{h} \Rightarrow \frac{r_{P}}{r_{Q}} = \frac{h_{Q}}{h_{P}} = \frac{h}{\frac{2}{3} h} = \frac{2}{3}$

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