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A capillary tube of radius r can support...

A capillary tube of radius r can support a liquid of weight `6.28 xx 10^(-4)` N. If the surface tension of the liquid is `5 xx 10^(-2)` N/m. The radius of the capillary must be:

A

`2.5xx10^(-4)m`

B

`1.5xx10^(-3)m`

C

`2.0xx10^(-4)m`

D

`2.0xx10^(-3)m`

Text Solution

Verified by Experts

The correct Answer is:
D
Weight is balanced by force of surface tension
W=T.2`pi`r
`rArrr=W/(2piT)=(6.28xx10^(-4))/(2x3.14xx5xx10^(-2))`
`=1/5xx10^(-2)=2xx10^(-3)m`
Thus the correct choice is (d).
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