Question

A capillary tube of radius r is lowered into a liquid of surface tension T and density $\rho$. Given angle of contact = $0^o$

• A. The work done by the surface tension be
• B. The potential energy acquired by the liquid in the capillary is
• C. Heat will be dissipated during the rise of liquid
• D. No heat will be dissipated during the rise of liquid

Answer 1

The correct option is A

The work done by the surface tension be

$F=T\left(2\pi r\right)W=FS=T\left(2\pi r\right)\frac{2T}{r\rho g}=\frac{4\pi T^2}{\rho g}$