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VMMC VMMC Medical Solved Paper-2005

  • question_answer
    Calculate the force required to separate the glass plate of area \[{{10}^{-2}}\,{{m}^{2}}\] with a film of water 0.05 mm thick [surface tension of water is \[70\times {{10}^{-3}}N/m\]]:

    A) 25 N      

    B)                        20 N                      

    C) 14 N                      

    D)        28 N

    Correct Answer: D

    Solution :

    Force required to separate the plates is \[F=\frac{2TA}{d}\]                         ?(i) Here: area \[={{10}^{-2}}\,{{m}^{2}}\] Thickness \[d=0.05\,mm\,\,=\,0.05\times {{10}^{-3}}m\] From equation (i), \[F=\frac{2\times 70\times {{10}^{-3}}\times {{10}^{-2}}}{0.05\times {{10}^{-3}}}=28\,N\]


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