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WB JEE Medical WB JEE Medical Solved Paper-2009

  • question_answer
    Two rods of equal length and diameter have thermal conductivities 3 and 4 units respectively. If they are joined in series, the thermal conductivity of the combination would be

    A)  3.43                                      

    B)  3.5

    C)  3.4                                        

    D)  3.34

    Correct Answer: A

    Solution :

                     In series,    \[R={{R}_{1}}+{{R}_{2}}\] \[\Rightarrow \]               \[\frac{2l}{{{K}_{eff}}A}=\frac{l}{{{K}_{1}}A}+\frac{l}{{{K}_{2}}A}\] \[{{K}_{eff}}=\frac{24}{7}=3.43\]


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