A capillary tube of internal radius ` 2 xx 10^(-3)` m immersed vertically in beaker containing a liquid rising in the capillary tube is ` 9 xx 10^(5)`
A capillary tube of internal radius ` 2 xx 10^(-3)` m immersed vertically in beaker containing a liquid rising in the capillary tube is ` 9 xx 10^(5)` kg , the surface tension of the liquid is
A. 70 N/m
B. 7 N/m
C. `0.7` N/m
D. `0.07`N/m
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Correct Answer - D
`mg = 2pi rT :. T = (mg)/(2pir)`
` = (9xx10^(-5)xx10)/(2xx3.14 xx2xx10^(-3)) = 0.07` N/m
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