Hydraulics And Fluid Mechanics

A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)
A. 4wd/σ cosα
B. σ cosα/4wd
C. 4σ cosα/wd
D. wd/4σ cosα

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Answer: Option C

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