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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2013

  • question_answer
        To break a wire of 1 m length, minimum 40 kg weight is required, then the wire of the same material of double and 6 m length will required breaking weight

    A)  80 kg wt             

    B)  240 kg wt

    C)  200 kg wt           

    D)  160 kg wt

    Correct Answer: D

    Solution :

                    Breaking force = Breaking stress\[\times \]area of cross-section of wire Breaking force\[\propto {{r}^{2}}\](breaking distance is constant) \[\frac{{{F}_{2}}}{{{F}_{1}}}={{\left( \frac{{{r}_{2}}}{{{r}_{1}}} \right)}^{2}}\] \[{{F}_{2}}=\frac{4\times 40}{1}=160\,kg\,wt\]


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