A drop of some liquid of volume 
is placed on the surface of a glass slide. Then, another glass slide is placed on it in such a way that the liquid forms a thin layer of area 
between the surfaces of the two slides. To separate the slides a force of 
dyne has to be applied normal to the surfaces. The surface tension of the liquid is (in dyne 
)
Text Solution
Verified by ExpertsThe correct answer is:
C
Let thickness of layer be 
.
So, volume, 
r = 
… (i)
and 
We know that, 
[From Eq.(i)]
where, 
dyne, 
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