First slide

Conduction

Question

Two cylinders of the same diameter, one. of iron and the other of silver, are placed in. close contact as shown in Fig. If the thermal conductivity of silver is 11 times that of iron the temperature of the interface A is approximately:

Moderate

A

91.7°C
B

80°C
C

50°C
D

8.3°C

Solution

$\frac{∆ Q}{∆ t} = \frac{K_{Ag} A (θ - 0)}{l} = \frac{K_{Fe} A (100 - θ)}{l}$
$θ = 8 . 5^{0} c$

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