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JEE Main & Advanced Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन Question Bank Pressure Difference

  • question_answer
    The adjoining diagram shows three soap bubbles A, B and C prepared by blowing the capillary tube fitted with stop cocks, S1, S2 and S3. With stop cock S closed and stop cocks S1, S2 and S3 opened                     [CPMT 1988]

    A) B will start collapsing with volumes of A and C increasing

    B)             C will start collapsing with volumes of A and B increasing

    C)             C and A both will start collapsing with the volume of B increasing

    D)                 Volumes of A, B and C will become equal at equilibrium

    Correct Answer: C

    Solution :

                    Excess pressure inside soap bubble is inversely proportional to the radius of bubble i.e. \[\Delta P\propto \frac{1}{r}\] This means that bubbles A and C posses greater pressure inside it than B. So the air will move from A and C towards B.


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