JEE Main 2019 Physics question
A heat source at T = K is connected to another heat reservoir at T = K by a copper slab which is 1 m thick. Given that the thermal conductivity of copper is 0.1 WK m, the energy flux through it in the steady state is:
Answer: (D)
Solution
Flux = kΔT/L = 0.1 × 900/1 = 90 W m.