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The rectangular slab is made of two parallel sided plates of copper and brass. The copper plate is \( 4 \mathrm{~cm} \) thick and brass plate is \( 3 \mathrm{~cm} \) thick. The coefficient of thermal conductivities of copper and brass are \( 386.4 \mathrm{~W} \mathrm{~m}^{-1} \mathrm{~K}^{-1} \) and \( 260 \cdot 4 \mathrm{~W} \mathrm{~m}^{-1} \) \( \mathrm{K}^{-1} \) respectively. The outer surface of copper plate is at \( 200^{\circ} \mathrm{C} \) and that of brass plate is at \( 20^{\circ} \mathrm{C} \). Find the - temperature of interface.
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