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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
    Two soap bubbles of radii  \[{{r}_{1}}\] and \[{{r}_{2}}\] equal to 4 cm and 5 cm are touching each other over a common surface \[{{S}_{1}}{{S}_{2}}\] (shown in figure). Its radius will be                              [MP PMT 2002]

    A) 4 cm   

    B)             20 cm

    C)             5 cm   

    D)             4.5 cm

    Correct Answer: B

    Solution :

                    \[r=\frac{{{r}_{1}}{{r}_{2}}}{{{r}_{1}}-{{r}_{2}}}=\frac{5\times 4}{5-4}=20\ cm\]


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