Calculate the excess pressure inside a soap bubble of radius $0.5 \mathrm{cm}$ if $S.T$. of soap solution is $3.2\times {10}^{-2} N/\mathrm{m}$.

In the given figure what is the pressure difference between points $A$ and $B$.

Which of the following graphs may represent the relation between capillary rise $h$ and radius of the capillary tube.