The end of a capillary tube with a radius r is immersed in water. Is mechanical energy conserved when the water rises in the tube? The tube is sufficiently long. If not, calculate the energy change.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
In the equilibrium position 
for water and glass)
ог 
Work done by surface tension 
The potential energy of water in the tube 
, it is multiplied by 
because the centre of gravity of the water and the capillary tube is at a height 
Thus it is seen that the mechanical energy is not conserved. therefore,
mechanical enegy loss 
This energy is converted into heat.
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