Question: What is the thermal conductivity of a material if a 1 m² area conducts 100 W of heat through a thickness of 0.1 m with a temperature difference of 50°C?

Options:

1. 0.2 W/m°C
2. 0.5 W/m°C
3. 1 W/m°C
4. 2 W/m°C

Correct Answer: 0.5 W/m°C

Solution:

Using Fourier\'s law, Q = kA(ΔT/d), we have 100 = k * 1 * (50/0.1), thus k = 0.5 W/m°C.