A square wire frame of size L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of liquid is T, then force acting on a frame will be
A
2TL
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B
4TL
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C
8TL
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D
16TL
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Solution
The correct option is C8TL Perimeter of square wire frame =4×L. As soap film has two interfaces. ∴ Length of wire on which surface tension force is acting =2×(4×L)=8L We know, T=FLTotal