1.

A capillary tube of radius r is dipped in a liquid of density r and surface tension S. If the angle of contact is q, the pressure difference between the two surfaces in the beaker and the capillary

A.             \[\frac{S}{r}\cos \theta \]
B.                      \[\frac{2S}{r}\cos \theta \]
C.             \[\frac{S}{r\cos \theta }\]       
D.             \[\frac{2S}{r\cos \theta }\]
Answer» C.             \[\frac{S}{r\cos \theta }\]       


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