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JEE Main & Advanced Physics Transmission of Heat Question Bank Conduction

  • question_answer
    A metal rod of length 2m has cross sectional areas 2A and A as shown in figure. The ends are maintained at temperatures 100°C and 70°C. The temperature at middle point C is  [CPMT 2000]

    A)            80°C

    B)            85°C

    C)            90°C

    D)            95°C

    Correct Answer: C

    Solution :

                       Let q  be temperature middle point C and in series rate of heat flow is same Þ \[K(2A)(100-\theta )=KA(\theta -70)\]            Þ \[200-2\theta =\theta -70\] Þ \[3\theta =270\]Þ \[\theta =90{}^\circ C\]


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