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BVP Medical BVP Medical Solved Paper-2003

  • 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)                 \[F=\frac{2\times 70\times {{10}^{-3}}\times {{10}^{-2}}}{0.05\times {{10}^{-3}}}=28N\]                  


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