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JEE Main & Advanced Physics Elasticity Question Bank Youngs Modulus and Breaking Stress

  • 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                                          [MP PMT 1999]

    A)                 \[\frac{1}{{{L}^{2}}}\]    

    B)                 \[\frac{1}{L}\]

    C)                 \[{{L}^{2}}\]      

    D)                          L

    Correct Answer: C

    Solution :

        \[l=\frac{FL}{AY}=\frac{F{{L}^{2}}}{(AL)Y}=\frac{F{{L}^{2}}}{VY}\]. If volume is fixed then \[l\propto {{L}^{2}}\]


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