First slide

Surface tension and surface energy

Question

Two capillaries made of the same material with radii $r_{1} = 1 mm$ and $r_{2} = 2 mm$ . The rise of the liquid in one capillary ( $r_{1} = mm$ ) is 30 cm, then the rise in the other will be

Moderate

A

7.5 cm
B

60 cm
C

15 cm
D

120 cm

Solution

$\frac{h_{2}}{h_{1}} = \frac{r_{1}}{r_{2}} = \frac{1}{2} \Rightarrow h_{2} = \frac{30}{2} = 15 cm$

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