Question

A long capillary tube of mass gram radius 2mm and negligible thickness is partially immersed in a liquid of surface tension 0.1n/m. Take the angle

Answer 1

Consider the formula  

F = mg + 2 S(2π r )  

Assumed,  

m = π gm, r = 2 mm = 2 × 10-3 m, S = 0. 1N/m , g = 10 m/  s 2

F = 10π + 2 × 0. 1(2 × π × 2 × 10 ) −3

F = 10. 8π mN