Water rises in a capillary tube to a certain height such that the upward force due to surface tension is balanced by `75xx10^-4` newton force due to the weight of the liquid. If the surface tension of water is `6xx`10^-2` newton/metre the inner circumference of the capillary must be:

Options

A. `1.25xx10^(-2) m`
B. `0.50xx10^(-2) m`
C. `6.5xx10^(-2) m`
D. `12.5xx10^(-2) m`

Answer

D

Explanation

`6xx10^(-2)xx" circumference "=Force`
`therefore" ""Circumference"=(75xx10^(-4))/(6xx10^(-2))=12.5xx10^(-2)m`