If thermal conductivity of a material of wall varies as $k_0 (1 - \alpha T)$, the temperature at the center of the wall will be ($\alpha$ is +ve)
- A. Depends on other factors
- B. More than that in case of constant thermal conductivity
- C. Less than that in case of constant thermal conductivity
- D. None of the above
Answer: C. Less than that in case of constant thermal conductivity
Explanation: With positive $\alpha$, k decreases as T increases. This non-linearity results in a temperature profile that bows downwards compared to the linear profile of constant k.