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 glass tube of small diameter (d) is dipped in fluid. The height of r

1.	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.	wd/σ cosα
B.	cosα/4wd
C.	σ cosα/wd
D.	d/4σ cosα
Answer» D. d/4σ cosα