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Punjab Medical Punjab - MET Solved Paper-2010

  • question_answer
    The force required to separate two glass plates of area\[{{10}^{-2}}{{m}^{2}}\]with a film of water\[0.05mm\] thick between them, is (surface tension of water is\[70\times {{10}^{-3}}N/m\])

    A) \[28N\]                                

    B) \[14N\]

    C) \[50N\]                                

    D) \[38N\]

    Correct Answer: A

    Solution :

    Force required to separate the plates\[F=\frac{2SA}{t}=\frac{2\times 70\times {{10}^{-3}}\times {{10}^{-2}}}{0.05\times {{10}^{-3}}}=28N\]


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