First slide

Surface tension and surface energy

Question

A capillary tube when immersed vertically in liquid records a rise of 3 cm. If the tube is immersed in the liquid at an angle of 60^o with the vertical. The length of the liquid column along the tube is

Moderate

A

9cm
B

6cm
C

3cm
D

2cm

Solution

Vertical height of the water in the tube remains constant
So, $l = \frac{h}{\cos θ} = \frac{3}{\cos 60^{\circ}} = 6 cm$

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