A 28. A capillary of radius r is lowered into a wetting agent with surface tension a and density d. (i) The height h0 to witch the liquid will rise in the capillary is - (A) 2 a d g r (B) 4 a d g r (C) 8 a d g r (D) a 8 d g r (ii) The work done by surface tension is - (A) 2 πa 2 d g (B) 4 πa 2 d g ( C ) 8 πa 2 d g (D) 12 πa 2 d g (iii) The potential energy acquired by the liquid in the capillary is equal to - (A) 4 πa 2 d g (B) 6 πa 2 d g ( C ) 2 πa 2 d g ( D ) 7 πa 2 d g Share with your friends Share 4 Shobhit Mittal answered this Dear student, i the rise in capillary is h=2αcosθdgrsince the liquid is sticky then we can consider theta very samll h=2αdgr option A is correctii work done is the rise i PE PE=hπr2d*g*h2=2αdgr2×πr2d*g2=2πα2dgwork done is equal to PEii option Aiii option CRegards -1 View Full Answer