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Manipal Engineering Manipal Engineering Solved Paper-2008

  • question_answer
    Which of the following circular rods. (given radius r and length 0 each made of the same material as whose ends are maintained at the same temperature will conduct most heat?

    A) \[r=2{{r}_{0}};l=2{{l}_{0}}\]         

    B)        \[r=2{{r}_{0}};l={{l}_{0}}\]

    C) \[r={{r}_{0}};l={{l}_{0}}\]                              

    D) \[r={{r}_{0}};l=2{{l}_{0}}\]

    Correct Answer: B

    Solution :

    \[\frac{Q}{t}\propto \frac{{{r}^{2}}}{l}\], from the given options, option (b) has higher value of\[\frac{{{r}^{2}}}{l}\].


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