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JEE Main & Advanced Sample Paper JEE Main Sample Paper-28

  • question_answer
    Which one of the following rods will conduct the highest quantity of heat assuming that their ends are maintained at the same steady temperatures \[{{T}_{1}}\] and\[{{T}_{2}}\]?

    A)  length 1 m and diameter 20 mm

    B)  length 2 m and diameter 20 mm

    C)  length 2 m and diameter 40 mm

    D)  length 1 m and diameter 40 mm

    Correct Answer: D

    Solution :

    Rate of heat flow \[=H=\frac{\Delta \theta }{R}\] where \[R=k\frac{l}{A}=k\frac{4l}{\pi {{D}^{2}}}\] When R high then rate of heat flow low.


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