Q.

Water in a clean aquarium forms a meniscus, as shown in the figure.
T = surface tension of liquid 
h = difference of height between centre and the edge
ρ  = density of liquid.
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a

h(Tρ)32

b

h(Tρ)12

c

h(Tρ)2

d

hTρ

answer is B.

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Detailed Solution

In the FBD only horizontal forces are shown.
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l=  length of side wall of aquarium
In equation 
   F1F2F3=0 h=2Tρg

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