A capillary tube is ipped in water . It ...

A capillary tube is ipped in water . It rises to height of 4 cm above the surroundings liquid . If the angle of caontact is zero and radius of tube is 0.4 mm , then the surface tension of liquid will be

`78.4` dyne/cm

`7.84` dyne / cm

784 dyne/cm

72 dyne/cm

Text Solution

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The correct Answer is:

` 2T cos theta = h rho gr`

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