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Haryana PMT Haryana PMT Solved Paper-2009

  • question_answer
    If Youngs modulus of elasticity Y for a material is one and half times its rigidity coefficient \[n\], the Poisson ratio a will be

    A) \[+\frac{2}{3}\]                                

    B) \[-\frac{1}{4}\]

    C)  \[+\frac{1}{4}\]                               

    D)  \[-\frac{1}{4}\]

    Correct Answer: B

    Solution :

                    Youngs modulus, \[Y=\frac{3\eta }{2}\] We know that \[Y=2\eta (1+\sigma )\] \[\therefore \]  \[\frac{3\eta }{2}=2\eta (1+\sigma )\] \[\Rightarrow \]               \[\sigma =-\frac{1}{4}\]


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