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Question

Water rises in a capillary tube to a certain height such that the upward force due to surface tension is balanced by 75×104 N force due to the weight of the liquid. If the surface tension of water is 6×102 N/m, the inner circumference of the capillary tube must be: (Take θ=0)

A
1.25×102 m
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B
0.50×102 m
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C
6.5×102 m
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D
12.5×102 m
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Solution

The correct option is D 12.5×102 m
Given: Weight of liquid column = Upward force due to surface tension
W=(2πr)×T
For water θ=0,
Inner circumference,
2πr=WT=75×1046×102=12.5×102 m

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