A metal sheet 
on a side and of negligible thickness is attached to a balance and inserted into container fluid. The balance to which metal sheet is attached read 
and the contact angle is found to be zero. A small amount of oil is then spread over the metal sheet. The contact angle now becomes 
and the balance now reads 
. The surface tension of the fluid is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Let 
be the contact angle and F be the force
So, 
when 
when 
So, this system, we have 
length of sheet
Surface tension, 
Here, 
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