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Mechanical Properties Of Fluids

Question

Water rises in a capillary upto a extension height such that upward force of surface tension balances the force of 75 x 10^-4 N due to weight of water. If surface tension of water is 6x10^-2 N/m.The internal circumference of the capillary must be

12.5 $\times 10^{- 2}$ m

6.5 $\times 10^{- 2}$ m

0.50 $\times 10^{- 2}$ m

1.25 $\times 10^{- 2}$ m

Solution

12.5 $\times 10^{- 2}$ m

F=TL

$L = \frac{F}{T} = \frac{75 \times 10^{- 4}}{6 \times 10^{- 2}} = 12.5 \times 10^{- 2} m$