The radii of two columns in a U tube are r1 and r2 when a liquid of density P is filled in it.the level difference of the liquid in the two arms in h.The surface tension of the liquid is
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the upward force due to surface tension on the columns of liquid on two sides: = 2 π r1 S and 2 π r2 S. let r2 > r1.
The weight of liquid of height h = ρ g h
So 2 π (r2 - r1) S = ρ g h
S = ρ g h /[2 π (r2 - r1) ]
The weight of liquid of height h = ρ g h
So 2 π (r2 - r1) S = ρ g h
S = ρ g h /[2 π (r2 - r1) ]
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