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BCECE Engineering BCECE Engineering Solved Paper-2005

  • question_answer
    A wire is stretched by 1 mm by a force of 1 k N. The work done in stretching the wire is :

    A)  5 erg                    

    B)                         5 J

    C)         0.5 erg                                

    D)         0.5 J

    Correct Answer: D

    Solution :

    Work done by force F in stretching the wire through distance \[x\] is, \[W=\frac{1}{2}fx\] Given,                   \[F=1\,kN=1000\,N,\]                                 \[x=1\,mm\,=1\times {{10}^{-3}}\,m\] \[W=\frac{1}{2}\times 1000\times 1\times {{10}^{-3}}=0.5\,J\]


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