A uniform rod conducts a steady heat current between two fixed temperatures
PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics
Problem
A uniform rod conducts a steady heat current between two fixed temperatures. Which one of the following single changes will increase the heat current, keeping every other quantity unchanged?
(a) Doubling the length of the rod
(b) Halving its cross-sectional area
(c) Doubling its cross-sectional area
(d) Replacing the rod by a material of lower thermal conductivity