Question

There is a small air bubble of radius r at bottom of a tube of radius R filled with a liquid as shown in the figure. The liquid column in the tube is h and surface tension of liquid is T. The pressure inside air bubble is (consider r $<<$h) and atmospheric pressure as $P_o$.

• A. $P_o+h\rho g$
• B. $P_o+h\rho g+\frac{2T}{r}$
• C. $P_o+h\rho g+2T\left[\frac{1}{R}+\frac{1}{r}\right]$
• D. $P_o+h\rho g+2T\left(\frac{R-r}{Rr}\right)$

Answer 1

The correct option is A $P_o+h\rho g$