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Figure shows a capillary tube of radius ...

Figure shows a capillary tube of radius r dipped into water. If the atmosphere pressure is `P_0`, the pressure at point A is

A

`P_(0)`

B

`P_(0)+(2s)/r`

C

`P_(0)-(2s)/r`

D

`P_(0)-(4s)/r`

Text Solution

Verified by Experts

The correct Answer is:
C
`P_(A)=P_(0)-(2S)/r`
The pressure inside a concacve meniscus is less than the pressure outside (atmosphere). Assuming the meiscus to be spherical (as for thin capillaries) excess pressure is `2S//r` where `r` is the radius of the hemispherical surface.
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