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NEET 2017 · Heat Conduction

Heat Conduction question from NEET 2017

Q49NEET 2017Medium

Heat Conduction

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite will be

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Answer: (d)

The rods are side by side between $T_1$ and $T_2$ , so they are in parallel; each has area $A$ , total $2A$ .
$\frac{K(2A)\Delta T}{d} = \frac{K_1A\Delta T}{d} + \frac{K_2A\Delta T}{d}$
$K = \frac{K_1+K_2}{2}$ , so the answer is (d).

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