Consider water in a glass capillary with the initial configuration shown below. The capillary is circular
in cross-section, but with two sections, A of radius R and B of radius r, with R gt; r. The contact angle
of water on the wall of the capillary is less than 90′, and we neglect any possible effects of contact
angle hysteresis. (4 marks)
a) Is there an imbalance in pressure between A and B? Briefly explain your answer.
b) If the liquid is allowed to reach equilibrium in which direction will it flow? Briefly explain your
R gt; rScience