First slide

Conduction

Question

Two rods of same material, cross-section and length are welded end to end. The temperature difference across the ends of the composite rod is 100°C. 10 cal of heat flows through tie combination in 10 minutes. lf the rods are welded side by side how much time will 10 cal heat take to go across the combination ?

Moderate

A

2.5 min
B

5 min
C

15 min
D

20 min

Solution

$\begin{array}{l} \frac{KAΔT}{l} \times t_{1} = \frac{K (2 A) ΔT}{l / 2} t_{2} \\ t_{2} = \frac{t_{1}}{4} = \frac{10}{4} = 2 \cdot 5 second. \end{array}$

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