question_answer

Heat is flowing through two cylinderical 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

A) 2 : 1

B) 8 : 1

C) 1 : 1

D) 1 : 8