Physics
Consider a water tank shown in the figure. It has one wall at 
and can be taken to be
very wide in the 
direction. When filled with a liquid of surface tension S and density 
, the liquid surface makes angle 
with the 
-axis at 
. If 
is the height of the surface then the equation for 
is:
(take 
is the acceleration due to gravity)
Text Solution
Verified by ExpertsPhysics
For the given element, (consider length d in Z direction) Net force in upward direction 
Weight 
Angle is small 
…… ..(i)
Differentiating wrt 
…… .(ii)
Put 
from (ii) in (i) d take 
, we get 
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