Question

Water rises in a capillary tube to a certain height such that the upward force due to surface tension is balanced by $75\times {10}^{-4}$N force due to the weight of the liquid. If the surface tension of water is $6\times {10}^{-2}N{m}^{-1}$, the inner circumference of the capillary must be

• A.
• B.
• C.
• D.

Answer 1

The correct option is D

$6\times {10}^{-2}\times$Circumference = Force

$\therefore$ Circumference =$\frac{75\times {10}^{-4}}{6\times {10}^{-2}}$= $12.5\times {10}^{-2}$m