First slide

Surface tension

Question

The mass of water that rises in capillary tube of radius R is M. The mass of water that rises in tube of radius 2R is:

Easy

A

M
B

M/2
C

2 M
D

4 M

Solution

Mg= 2 $π R T$
M $α R$
if radius is doubled then mass of the liquid will also be doubled in the capillary tube.
2 M=volume x density $= {πr}^{2} hρ$

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