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Two soap bubbles in contact: radius of curvature of the common surface

The same question, asked 2 times: 2021 Paper 7*, 22 Jan 2025. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2021 Paper 7

    2
    When two soap bubbles of radii aa and b(b>a)b(b>a) coalesce, the radius of curvature of common surface is :

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  2. Question 2

    22 Jan 2025

    21
    Two soap bubbles of radius 2 cm and 4 cm , respectively, are in contact with each other. The radius of curvature of the common surface, in cm , is ____ .