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Water rises in a capillary tube to a cer...

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:

A

`1.25xx10^(-2)m`

B

`0.50xx10^(-2)m`

C

`6.5xx10^(-2)m`

D

`12.5xx10^(-2)m`

Text Solution

Verified by Experts

The correct Answer is:
D
Weight of liquid = upward force due to surface tension
`75xx10^(-4) = 2pirT`
Circumference `2pir = (75xx10^(-4))/(T) = (75xx10^(-4))/(6xx10^(-2)) = 0.125 = 12.5xx10^(-2)m`
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