Question

# A long capillary tube of radius $$1 mm$$, open at both ends is filled with water and placed vertically. What will be the height of water column left in the capillary ? (Surface tension of water is $$73.5 \times 10^{-3} N.m^{-1}$$)

A
0.3cm
B
3cm
C
6cm
D
0.03cm

Solution

## The correct option is C $$3cm$$$$\text{Remaining weight water = force due to surface tension.}$$$$\pi r^2h\rho g=2\times 2\pi r\cos\theta$$$$h=0.03\ \text{m}=3\ \text{cm}$$Physics

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