Question

# Heat is flowing through two cylindrical rods of the same material. The diameters of the rods are in the ratio 1 : 2 and the lengths in the ratio 2:1. If the temperature difference between the ends is same, then ratio of the rate of flow of heat through them will be : (1) 2:1 (2) 8:1 (3) 1:1 (4) 1:8

Solution