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

  • question_answer
    A wire of cross-sectional area \[3\,m{{m}^{2}}\] is first stretched between two fixed points at a temperature of 20°C. Determine the tension when the temperature falls to 10°C. Coefficient of linear expansion \[\alpha ={{10}^{-5}}{}^\circ {{C}^{-1}}\] and \[Y=2\times {{10}^{11}}\,N/{{m}^{2}}\]                               [EAMCET 1994]

    A) 20 N      

    B)                 30 N

    C)                 60 N      

    D)                 120 N

    Correct Answer: C

    Solution :

        \[F=YA\alpha \Delta t\]\[=2\times {{10}^{11}}\times 3\times {{10}^{-6}}\times {{10}^{-5}}\times (20-10)=60N\]           


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