Question

Surface tension of water is 70 x 10${}^{-3}$ Nm${}^{-1}$ and g $=$ 10 ms${}^{-2}$. When a capillary tube of radius 0.5mm is dipped in water, the length of the liquid column due to rise of liquid in the capillary is cm:

• A. 0.28
• B. 0.028
• C. 2.8
• D. 2.8 x 10${}^{-3}$

Answer 1

The correct option is C 2.8

$h=\frac{2Tcos\theta }{\pi \zeta g}$
$=\frac{2\times 70\times {10}^{-3}cos0}{.5\times {10}^{-3}\times 10\times 1000}$
$\eta =.028m$
$=2.8cm$