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

Heat is flowing through two cylindrical rods of the same material. The

1.	Heat is flowing through two cylindrical rods of the same material. The fiameters of the rods are in the ratio 1:2 and the lengths in the ratio 2:1. If the temperature difference between the ends be the same, then the ratio of the rate of flow of heat through them will be :
Answer» `1:8` `1:8` `1:1` `4:1` Solution :`(Q)/(t)PROP(A)/(l)""rArrHprop(A)/(l)` `(H_(1))/(H_(2))=(A_(1))/(A_(2))xx(l_(2))/(l_(1))=1/4xx1/2=1/8` Hence the correct choice is (b).

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

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