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Dear Abhranil,let x be the angle of contact then...force of surface tension=2.pie.r.S.cosxdisplacement=hWork done by surfave tension=2.pie.r.h.S.cosxalso work done against Gravity=mgh=pie.(rh)^2.d.g.Heat evolved =Difference in work done= 2.pie.r.cosx.S - pie.d.g.(rh)^2=> pie.r [ 2.S.cos x - d.g.r.(h^2) ](ANS)If angle of contact is 0 then put x=0 to get the req. ans.Regards.
If angle of contact is 0 then put x=0 to get the req. ans.
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