Two walls of thicknesses $d_1$ and $d_2$ and thermal conductivities $k_1$ and $k_2$ are in contact. In the steady state, if the temperatures at the outer surfaces are ${T_1}$ and ${T_2}$, the temperature at the common wall is
Two walls of thicknesses $d_1$ and $d_2$ and thermal conductivities $k_1$ and $k_2$ are in contact. In the steady state, if the temperatures at the outer surfaces are ${T_1}$ and ${T_2}$, the temperature at the common wall is
- A
$\frac{{{k_1}{T_1}{d_2} + {k_2}{T_2}{d_1}}}{{{k_1}{d_2} + {k_2}{d_1}}}$
- B
$\frac{{{k_1}{T_1} + {k_2}{d_2}}}{{{d_1} + {d_2}}}$
- C
$\left( {\frac{{{k_1}{d_1} + {k_2}{d_2}}}{{{T_1} + {T_2}}}} \right){T_1}{T_2}$
- D
$\frac{{{k_1}{d_1}{T_1} + {k_2}{d_2}{T_2}}}{{{k_1}{d_1} + {k_2}{d_2}}}$
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