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Excess pressure inside a soap bubble (P = 4T/r)

This type of question, asked 3 times: May 2022 S1, 11 May 2024 S2, 20 Apr 2026 S1. All 3 questions below, oldest first.

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  1. Question 1

    May 2022 S1

    49
    The excess pressure inside a soap bubble of radius 2 cm is 50 dyne/cm2^2. The surface tension is

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  2. Question 2

    11 May 2024 S2

    20
    What should be the diameter of a soap bubble, in order that the excess pressure inside it is 25.6 Nm−225.6\,\text{Nm}^{-2}? [Surface tension of soap solution =3.2×10−2 Nm−1= 3.2 \times 10^{-2}\,\text{Nm}^{-1}]

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  3. Question 3

    20 Apr 2026 S1

    110
    The excess pressure inside a soap bubble of radius 2.52.5 cm is 48 dyne/cm248\ \mathrm{dyne/cm^2}. The surface tension of soap solution in dyne /cm is

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