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JEE Main & Advanced Physics Transmission of Heat Question Bank Conduction

  • question_answer
    Which of the following circular rods. (given radius r and length l) each made of the same material as whose ends are maintained at the same temperature will conduct most heat                                                                       [CBSE PMT 2005]

    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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