A liquid film is formed over a frame ABCD as shown in figure. Wire CD can slide without friction. The mass to be hung from CD to keep it in equilibrium is
A
B
C
D
T × × l
Text Solution
Verified by ExpertsThe correct answer is:
B
A liquid film has two surfaces, so upward force 
According to question,
Weight of the body hanged from wire ( 
)
Upward force due to surface tension ( 
)
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