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NEET Sample Paper NEET Sample Test Paper-89

  • question_answer
    A steel rod of radius R = 10 mm and length L = 100 cm is stretched along its length by a force F\[=6.28\times {{10}^{4}}N.\] If the Young's modulus of steel is Y\[=2\times {{10}^{11}}N/{{m}^{2}},\] the percentage elongation in the length of the rod is

    A) 0.001

    B)        0.314

    C) 2.015   

    D)        1.549

    Correct Answer: A

    Solution :

    [a] \[\Delta \ell =\frac{F\ell }{AY}\] \[=\frac{6.28\times {{10}^{4}}\times (1)}{\pi {{(0.01)}^{2}}\times 2\times {{10}^{11}}}=\frac{1}{1000}\]      


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