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One face of a sheet of cork \( 3 \mathrm{~mm} \) thick is placed in contact with a glass sheet \( 5 \mathrm{~mm} \) thick, both sheets being \( 20 \mathrm{~cm} \) square. The outer face of this square composite sheet are maintained at \( 100^{\circ} \mathrm{C} \) and \( 20^{\circ} \mathrm{C} \), the cork being at higher temperature. Find the temperature of glass-cork interface. Given, thermal conductivity of cork \( =6.3 \times 10^{-2} \mathrm{~W} \) \( \mathrm{m}^{-1} \mathrm{~K}^{-1} \) and thermal conductivity of glass \( =7.2 \times 10^{-1} \mathrm{~W} \) \( \mathrm{m}^{-1} \mathbf{K}-1 \).
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