Question

A capillary tube of uniform bore is dipped vertically in water which rises by 7 cm in tube . Then the radius of capillary tube is (S.T of water is 70 dyne/cm , g = 1000 `"cm/s"^(2) theta = 0^(@)) `
A. `0.2 ` mm
B. 2 mm
C. `0.2` cm
D. 2 cm

Answer 1

Correct Answer - A
` r = (2Tcos theta )/(h rho g) = (2xx70xx1)/(7xx10^(3)xx1) = 0.2 ` mm