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JIPMER Jipmer Medical Solved Paper-2005

  • question_answer
    The radius R of the soap bubble is doubled under isothermal condition- If T be the surface tension of soap bubble. The work done in doing so is given by:

    A)  \[32\pi {{R}^{2}}T\]                       

    B)         \[24\pi {{R}^{2}}T\]       

    C)         \[8\pi {{R}^{2}}T\]          

    D)         \[4\pi {{R}^{2}}T\]

    Correct Answer: A

    Solution :

    Initial surface energy \[{{\omega }_{1}}=2\times 4\pi {{R}^{2}}T=8\pi {{R}^{2}}T\] Final surface energy \[{{\omega }_{2}}=2\times 4\pi {{(2R)}^{2}}T=32\pi {{R}^{2}}T\]


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