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, = Angle of contact of the liquid surface, and = Surface tension)

A. 4wd/ cos
B. cos /4wd
C. 4 cos /wd
D. wd/4 cos
Answer» D. wd/4 cos


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