First slide

Surface tension

Question

A capillary tube of radius 0.20 mm is dipped vertically in water. The height of the water column raised in the tube, will be (surface tension of water = 0.075 N/m and density of water = 1000 kg/ $m^{3}$ . Take g = 10 $m / s^{2}$ and contact angle 0°).

Moderate

A

7.5 cm
B

6 cm
C

5 cm
D

3 cm

Solution

We have,
$h = \frac{2 S \cos θ}{rρg} = \frac{2 \times 0.075 N / m \times 1}{(0.20 \times 10^{- 3} m)}$
= 0.075m = 7.5 cm

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