First slide
Conduction
Question

In a composite rod, when two rods of different lengths and of the same area of cross-section are joined end to end, then if K is the effective coefficient of thermal conductivity I1+I2kis equal to

Moderate
Solution

R=R1+R2  Thermal Resistance R=LkAL1+L2kA=L1k1A+L2k2A L1+L2k=L1k1+L2k2

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