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A capillary tube is radius 0.02 cm is di...

A capillary tube is radius 0.02 cm is dipped vertically in a beaker containing mercury . The level of mercury in the tube with respect to the mercury level in the beaker will be
(Given density of mercury 13.5 g/cc ,Surface tension 540 dyne/cm and the angle of contact `135^(@)` )

A

`2.88` cm below

B

`2.88 ` cm above

C

` 4.08 `cm below

D

` 4.08 ` cm above

Text Solution

Verified by Experts

The correct Answer is:
A
`2T cos theta = h rho gr`
` :. h = (2T cos theta )/(pgr) = (2xx540 xxcos_(1)xx35)/(13.5 xx1000xx0.02)`
` = (-2 xx540 xx sin 45)/(135xx2)`
` = (-540)/(135) xx1/(sqrt(2)) = -2.88 `cm below
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