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Second Law of Motion

The lower end...

Question

The lower end of a capillary tube is at a depth of 12 cm and the water rises 3 cm in it. The mouth pressure required to blow an air bubble at the lower end will be X cm of water column where X is :

A

3

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B

9

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C

12

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D

15

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Solution

The correct option is D 15
From the figure,

$P = P_{1} - P_{0}$

$P = P_{0} + ρ g h - P_{0} = ρ g h$

$ρ g x = (3 + 12) ρ g$

$x = 15 c m$

The correct option is D.

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