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JEE Main & Advanced AIEEE Solved Paper-2012

  • question_answer
    A thin liquid film formed between a U-shaped wire and a light slider supports a weight of \[1.5\times {{10}^{-2}}\] N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is :                AIEEE  Solved  Paper-2012

    A) 0.0125 \[N{{m}^{-1}}\]                     

    B)  0.1 \[N{{m}^{-1}}\]

    C) 0.05 \[N{{m}^{-1}}\]                          

    D) 0.025 \[N{{m}^{-1}}\]

    Correct Answer: D

    Solution :

                 \[2TL=mg\] \[T=\frac{mg}{2L}=\frac{1.5\times {{10}^{-2}}}{2\times 30\times {{10}^{-2}}}=\frac{1.5}{600}=0.025\] N/m


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