JEE Main & Advanced Physics Transmission of Heat Question Bank Topic Test - Transmission of Heat (3-5-21)

  • 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

    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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