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JEE Main & Advanced Physics Transmission of Heat Question Bank Conduction

  • question_answer
    The heat is flowing through two cylindrical rods of same material. The diameters of the rods are in the ratio 1 : 2 and their lengths are in the ratio 2 : 1. If the temperature difference between their ends is the same, the ratio of rate of flow of heat through them will be [NCERT 1982; CBSE PMT 1995; EAMCET 1997]

    A)            1 : 1                                          

    B)            2 : 1

    C)            1 : 4                                          

    D)            1 : 8

    Correct Answer: D

    Solution :

                       \[\theta =\frac{5K\times 100+3K\times 20}{5K+3K}\] Þ \[=\frac{560K}{8K}\]   (d = Diameter of rod)            Þ \[({{37.4}^{o}}C)\]


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