First slide

Surface tension

Question

Water rises to a height of 10 cm in a glass capillary tube. If the area of cross-section of the tube is reduced to one fourth of the former value, what is the height of water rise now?

Moderate

A

20 cm
B

5 cm
C

2.5 cm
D

7 cm

Solution

Area reduced to one-fourth. Radius reduced to one-half. Since $h \propto \frac{1}{r}$ , therefore, h is doubled.

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