Surface tension arises from the cohesive force between the surface molecules. Interplay between cohesion and adhesion force make the surface inclined at acute or obtuse angle with the contacting solid surfaces. This causes a capillary rise (or fail) given as `h=(2Tcostheta)/(rhogr)`, where `theta=` angle of contact `T=` surface tension `rho=` density of the liquid, `g=` acceleration due to gravity and `r=` radius of the capillary tube.
Q. In capillary action `theta` can be:

Options

A. `0^(@)`
B. `90^(@)`
C. `90^(@)ltthetalt180^(@)`
D. all of these

Answer

D

Explanation

Angle of contact lies between `0^(@)` to `180^(@)`