Two metallic plates of thickness \( d_{1} \) and \( d_{2} \) and th...
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1Two metallic plates of thickness \( d_{1} \) and \( d_{2} \) and thermal conductivities \( \mathrm{K}_{1} \) and \( \mathrm{K}_{2} \) are placed in contact. Prove that their equivalent thermal conductivity is given by
\[
\mathrm{K}=\frac{d_{1}+d_{2}}{d_{1} / \mathrm{K}_{1}+d_{2} / \mathrm{K}_{2}}
\]
\( \mathrm{P} \)
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