A square frame of side L is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of the liquid is T, the force acting on the frame will be

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2 TL

4 TL

8 TL

10 TL

answer is C.

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Detailed Solution

Force on each side =2 TL (due to two surfaces)∴ Force on the frame = 4(2 TL)= 8TL

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