In a capillary tube water rises upto a certain height such that the upward force of surface tension balances the force of `75xx10^(-4)N`. Due to weight of water, the internal circumference of capillary must be (ST of water`=6xx10^(-2)N//m`)

Options

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

Answer

D

Explanation

Upward force is given by `F=Tl`
`therefore`the internal circumference of the capillary is
`l=(F)/(T)=(75xx10^(-4))/(6xx10^(-2))=12.5xx10^(-2)m`