A solid copper rod (thermal conductivity 385 W m⁻¹ K⁻¹) 8.0 cm long is to conduct 15…
PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
A solid copper rod (thermal conductivity 385 W m⁻¹ K⁻¹) 8.0 cm long is to conduct 15 W of thermal energy between two plates maintained 20 K apart. Manufacturing limits the rod’s volume to no more than 20 cm³. Determine the smallest cross-sectional area, in cm², that satisfies both the heat-transfer requirement and the volume constraint.