First slide

Surface tension

Question

In a capillary tube of glass having radius 0.5 mm, the height upto which water can be filled without any dripping out (surface tension of water is 0.15 SI units)

Easy

A

12 cm
B

12 mm1
C

1.2 mm
D

1.2 m

Solution

$4 πrS = {πr}^{2} ρgh$
$h = \frac{4 S}{ρgr} = 12 cm$

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