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JEE Main & Advanced Physics Elasticity Question Bank Work Done in Stretching a Wire

  • question_answer
    Two wires of same diameter of the same material having the length l and 2l. If the force F is applied on each, the ratio of the work done in the two wires will be             [MP PET 1989]

    A) 1 : 2       

    B)                 1 : 4

    C)                 2 : 1       

    D)                 1 : 1

    Correct Answer: A

    Solution :

    \[W=\frac{1}{2}Fl\] \ \[W\propto l\]        (F is constant) \ \[\frac{{{W}_{1}}}{{{W}_{2}}}=\frac{{{l}_{1}}}{{{l}_{2}}}=\frac{l}{2l}=\frac{1}{2}\]


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