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  3. WB JEE Medical

WB JEE Medical WB JEE Medical Solved Paper-2006

  • question_answer
    A square wire frame of size L is dipped in a liquid. On taking out a membrane is formed. If the surface tension of liquid is T, then force acting on a frame will be :

    A)  2T L                                      

    B)  4T L

    C)  8T L                                      

    D)  16 T L

    Correct Answer: C

    Solution :

                     Since the wire frame is dipped in liquid,therefore its membrane has two free surfaces.Total length of square wire frame in contact ofmembrane      = 2 \[\times \] perimeter of square \[=2\times 4L=8L\] Hence, force acting on a frame\[F=T\,l=T\times 8L=8T\,L\]


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