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 103

Solution

## The correct option is C 2.8$$h=\dfrac{2T cos\theta }{\pi \zeta g}$$$$=\dfrac{2\times 70\times 10^{-3}cos 0}{.5\times 10^{-3}\times 10\times 1000}$$$$\eta =.028 m$$$$=2.8 cm$$Physics

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