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In the U-tube, radius of one arm is R an...


In the `U-`tube, radius of one arm is `R` and the other arm is `2R`. Find the difference in water level if contact angle is `theta = 60^(@)` and surface tension of water is `T`.

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Balancing pressure at points `A` and `B` situated in same horizontal level.
`P_(0) - (2T)/(R) cos theta + rhogDeltah = P_(0) - (2T)/(2R) cos theta`
here `theta = 60^(@)`, solving we get
`Deltah = (T)/(2rhogR)`
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