Water rise in capillary tube when its one end is dipped vertically in it, is 3 cm. If the surface tension of water is `75xx10^-3(N)/(m)`, then the diameter of capillary will be (Take angle of contact`=0^@C`)

Options

A. `0.1mm`
B. `0.5mm`
C. `1.0mm`
D. `2.0mm`

Answer

B

Explanation

`h=(2sigmacostheta)/(rrhog)` or `r=(2sigmacostheta)/(hrhog)`
or `r=(2xx75xx10^-3xxcos0^@)/(3xx10^-2xx10^3xx10)m=5xx10^-4m`