When a capillary tube of radius r is immersed in a liquid of density `rho,` the liquid rises to a height h in it. If m is the mass of the liquid in the capillary tube, find the potential energy of this mass of the liquid in the tube.

Answer

`mgh//2`

Explanation

The centre of gravity of mass m of the liquid in the capillary tube will be at height h/2 from the surface of liquid where h is the height through which liquid rises in the tube. Therefore, potential energy of liquid in the tube =mgh/2.