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NEET Sample Paper NEET Sample Test Paper-84

  • question_answer
    A uniform rod of mass m, length \[\ell \], area of cross- section A has Young's modulus Y. If it is hanged vertically, elongation under its own weight will be

    A) \[\frac{mgl}{2AY}\]       

    B)        \[\frac{2mgl}{AY}\]           

    C) \[\frac{mgl}{AY}\]

    D)        \[\frac{mgY}{A\ell }\]

    Correct Answer: C

    Solution :

    [c] \[Y=\frac{F\ell }{A\Delta \ell }\]\[\Rightarrow \]\[\Delta \ell =\frac{F\ell }{YA}=\frac{mg\ell }{YA}\]         


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