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JIPMER Jipmer Medical Solved Paper-2003

  • question_answer
    A fixed volume of iron is drawn into a wire of length \[l.\] The extension \[x\] produced in this wire by a constant force F is proportional to:            

    A)  \[l\]                                      

    B)  \[{{l}^{2}}\]                       

    C)  \[\frac{1}{l}\]                   

    D)         \[\frac{1}{{{l}^{2}}}\]

    Correct Answer: B

    Solution :

    Extension \[x=\frac{Fl}{AY}\]                      \[\left( \begin{align}   & \text{as}\,V=Al \\  & \text{so}\,A=\frac{V}{l} \\ \end{align} \right)\]        \[=\frac{F{{l}^{2}}}{VY}\propto {{l}^{2}}\]


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