$2\mathrm{.}3.$ A capillary tube with radius $20m$ and $3\mathrm{.}93$ in$.$

$[100$ mm$]$ in length is filled with water. At time $=0,$ one

end of the capillary tube is inserted vertically in a beaker

containing oil $({}_o=0\mathrm{.}798)$ and kept $0\mathrm{.}79$ in$.20mm$ be$-$

low the surface of the oil. Then, the other end is exposed

to atmospheric pressure. What is the equilibrium distri$-$

bution of oil and water in the capillary tube if the surface

of the tube is $($a$)$ strongly oil wet $(=180),($b$)$ inter$-$

mediate wetted $(=90),$ and $($c$)$ moderately water wet

$(=45).$ IFT between the oil and water is $25$ dynes$/$cm

$[25m\frac{N}{m}$ and the IFT between air and water is $72$

dynes $\frac{?}{cm[72m\frac{N}{m}]}.$