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

  • question_answer
    Two wires are made of the same material and have the same volume. However first wire has cross- sectional area A and second wire has cross- sectional area 5A. If the length of first wire increases by \[\Delta l\] on applying force f, how much force is needed to stretch second wire by the same amount?

    A) \[14f\]

    B) \[6f\]   

    C) \[25f\]

    D) \[9f\]

    Correct Answer: C

    Solution :

    [c] Volume i.e.\[(A\times l)\] must be constant


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