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The radius of a capillary tube is 1.4 mm...

The radius of a capillary tube is 1.4 mm . Water of weight `6.28 xx 10^(-4)` N rises in the capillary tube, when it is dipped vertically in water . What is the surface tension of water ?

A

7 N/m

B

`7 xx10^(-1)`N/m

C

`7xx10^(-3)`N/m

D

`7xx10^(-2)`N/m

Text Solution

Verified by Experts

The correct Answer is:
D
The upward force due to S.T ` = 2pir xx T " " ( :. T = F/l)`
and the downward force = weight of the lifted water
` :. T xx 2pir = 6.28 xx 10^(-4)`
` :. T = (6.28xx10^(-4))/(2 xx 3.14 xx1.4 xx 10^(-3))`
` (10^(-1))/(1.4) = 7 xx 10^(-2) ` N/m
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