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JEE Main & Advanced Physics Transmission of Heat Question Bank Conduction

  • question_answer
    Two identical plates of different metals are joined  to form a single plate whose thickness is double the thickness of each plate. If the coefficients of conductivity of each plate are  2 and 3 respectively, then the conductivity of composite plate will be

    A)            5    

    B)            2.4

    C)            1.5 

    D)            1.2

    Correct Answer: B

    Solution :

                       Thermal conductivity of composite plate            \[{{K}_{eq}}=\frac{2{{K}_{1}}{{K}_{2}}}{{{K}_{1}}+{{K}_{2}}}=\frac{2\times 2\times 3}{2+3}\]\[=\frac{12}{5}\]=2.4


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