The liquid meniscus in capillary tube will be convex, if the angle of contact is

In a capillary tube of radius $\text{'}\mathrm{R}\text{'}$, a straight thin metal wire of radius 'r' $(\mathrm{R}>\mathrm{r})$ is inserted symmetrically and one end of the combination is dipped vertically in water such that the lower end of the combination is at same level. The rise of water in the capillary tube is $[\mathrm{T}=$surface tension of water, $\rho =$density of water, $\mathrm{g}=$gravitational acceleration $]$

A liquid rises to a height of $1.8\mathrm{cm}$ in a glass capillary "A" Another glass capillary 'B' having diameter $90\%$ of capillary "A" is immersed in the same liquid. The rise of liquid in capillary $\text{'}B\text{'}$ is 

When the temperature is increased the angle of contact of a liquid _____.