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What is the correct answer?

4

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

Correct Answer :

C. 4σ cosα/wd


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