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NEET Sample Paper NEET Sample Test Paper-76

  • question_answer
    Two wires of the same length and same material but radii in the ratio of \[1:2\] are stretched by unequal forces to produce equal elongation. The ratio of forces is

    A)  \[1:4\]              

    B)  \[1:2\]

    C)  \[2:1\]              

    D)  \[1:\sqrt{2}\]

    Correct Answer: A

    Solution :

    As,\[Y=\frac{Fl}{A\Delta l}\] According to question, Y, l and \[\Delta l\] are constant. So, \[F\propto A\,\,\,\,\Rightarrow \,\,\,\,\frac{{{F}_{1}}}{{{F}_{2}}}=\frac{\pi r_{1}^{2}}{\pi r_{2}^{2}}\,\,=\,\,\frac{1}{4}\]


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