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JEE Main & Advanced Physics Wave Mechanics Question Bank Self Evaluation Test - Mechanical Properties of Solids

  • question_answer
    The Poisson's ratio of a material is 0.5. If a force is applied to a wire of this material, there is a decrease in the cross-sectional area by 4%. The percentage increase in the length is:

    A) 1% 

    B) 2%  

    C) 2.5%

    D) 4%

    Correct Answer: B

    Solution :

    [b] \[\frac{\Delta r/r}{\Delta l/l}=0.5=\frac{1}{2},\frac{\Delta r}{r}=\frac{1}{2}\frac{\Delta l}{l}\]


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