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Surface tension from the work done in expanding a rectangular liquid film

The same question, asked 2 times: 22 Apr 2025 S1*, 12 May 2026 S1. Every wording below, oldest first.

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  1. Question 1

    22 Apr 2025 S1

    13
    A rectangular film of liquid is expanded from ( 5 cm×4 cm5\text{ }cm \times 4\text{ }cm ) to ( 7 cm×8 cm7\text{ }cm \times 8\text{ }cm ). If the work done is 3×10−4 J3 \times10^{- 4}\text{ }J, the surface tension of the liquid is (nearly)

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  2. Question 2

    12 May 2026 S1

    111
    A rectangular film of liquid is expanded from (66 cm ×5\times 5 cm) to (88 cm ×9\times 9 cm). If the work done is 4×10−44 \times 10^{-4} J, the surface tension of the liquid is

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