A capillary tube is dipped in water it rises to
height of 4cm above the surrounding liquid if
the
angle of contact is zero and radius of tube
lis 0.4 mm the surface tension of liquid is........
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If a capillary tube is dipped and the liquid levels inside and outside the tube are same, then the angle of contact is:
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The height h through which a liquid will rise in a capillary tube of inner radius r is given by
h=
rρg
2Scosθ
Where S is the surface tension, ρ is the density of the liquid and θ is the angle of contact.
If the liquid level inside and outside of the tube are same. We have cosθ=0, Since other variables can't be zero.
cosθ=0
⇒
θ=90
∘
So the correct option is 'B'.
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