Two bodies each of mass \( m \), having specific heats \( s \), are connected by a metal rod of ...

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Two bodies each of mass \( m \), having specific heats \( s \), are connected by a metal rod of negligible heat capacity of length \( l \), area of cross section \( A \) and thermal conductivity \( k \). Initially both bodies are at different temperatures, find the time taken for
\( \mathrm{P} \) the temperature difference between the two bodies to become

W half of the initial value.
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