The radii of the two columns in U-tube are r 1 and r 2 . When a liquid of density ρ (angle of contact is 0 0 ) is filled in it, the level difference of liquid in two arms is h. The surface tension of liquid is: (g = acceleration due to gravity):
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
In the shown diagram.
P C = P B
P 0 – 
+ ρ gh = P0 – 
Here, we may not know in advance which tube will rise above the other, but lets say the liquid level is
higher in thinner tube.
so 2T 
= – ρ gh.
T = 
as r 2 > r 1 ; so we assumed correctly
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