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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2007

  • question_answer
        A wire fixed at the upper end 3tretches by length\[l\]by applying a force F. The work done, in stretching is

    A)  \[\frac{F}{2l}\]                                 

    B)  \[Fl\]

    C)  \[2Fl\]                                 

    D)  \[\frac{Fl}{2}\]

    Correct Answer: D

    Solution :

                    Work done in stretching the wire = potential energy stored \[=\frac{1}{2}\times stress\times strain\times volume\]                 \[=\frac{1}{2}\times \frac{F}{A}\times \frac{l}{L}\times AL\]                 \[=\frac{1}{2}Fl\]


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