First slide

Surface tension and surface energy

Question

Two capillaries made of same material but of different radii are dipped in a liquid. The rise of liquid in one capillary is 2.2 cm and that in the other is 6.6 cm. The ratio of their radii is

Moderate

A

9 : 1
B

1 : 9
C

3 : 1
D

1 : 3

Solution

$r \propto \frac{1}{h} \Rightarrow \frac{r_{1}}{r_{2}} = \frac{h_{2}}{h_{1}} = \frac{6 .6}{2 .2} = \frac{3}{1}$

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