Question

The lengths and radii of two rods made of same material are in the ratios 1 : 2 and 2: 3 respectively; If the temperature
difference between the ends for the two rods be the same, then in the steady state, the amount of heat flowing per second
through them will be in the ratio:
(1)1:3
(2) 4:3
(3)8:9
(4)3:2
on afonner and aluminium are arraneadac chaun in fima​

Answer 1

Answer:

Explanation:

Amount of heat flowing per second  = Q/t   = KA ( θ1 - θ2)/l

Here "l" is the length of the rid. Since the rods are made up of the same material ad also the temperature is same on both ends of the rod therefore, KA ( θ1 - θ2) will e same for both rods.

(Q/t)1 / (Q/t)2 = r1^2 x l2/l1 x r2^2

                     = ( 2/3)^2  x 2

                     = 8/9

Thus the amount of heat flowing per second  through them will be in the ratio

8:9.

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