When a capillary is dipped in water, water rises 0.015 m in it. If the surface tension of water is `75 xx 10^(-3) N//m` , the radius of capillary is

Options

A. `0.1 mm`
B. `0.5mm`
C. 1 mm
D. 2 mm

Answer

C

Explanation

Height of liquid `h =(2T)/(rdg)`
`rArr r = (2T)/(hdg) = (2 xx 75 xx 10^(-3))/( 15 xx 10^(-3) xx 10)`
= 1 mm