First slide

Surface tension and surface energy

Question

In a capillary tube, water rises by 1.2 mm. The height of water that will rise in another capillary tube having half the radius of the first, is

Moderate

A

1.2 mm
B

2.4 mm
C

0.6 mm
D

0.4 mm

Solution

$h \propto \frac{1}{r} ∴ r_{1} h_{1} = r_{2} h_{2} \Rightarrow h_{2} = \frac{r_{1} h_{1}}{r_{2}} = 2 .4 mm$

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