Pure water rises in a capillary tube upto a height of 8 cm . If surface tension of water and acceleration due to gravity are 80 dyne/cm and 1000 `cm//
Pure water rises in a capillary tube upto a height of 8 cm . If surface tension of water and acceleration due to gravity are 80 dyne/cm and 1000 `cm//s^(2)` respectively , then the radius of capillary tube will be
A. 2 cm
B. `0.2` cm
C. 20 cm
D. ` 0.02 ` cm
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Correct Answer - D
` r = (2T cos theta )/(h rho g) = (2xx80xx1)/(8xx1xx1000)=0.02` cm
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