The ratio of thermal conductivity of two rods of different material is 5 : 4 . The two rods of same area of cross-section and same thermal resistance will have the lengths in the ratio

Question

The ratio of thermal conductivity of two rods of different material is 5 : 4 . The two rods of same area of cross-section and same thermal resistance will have the lengths in the ratio, 4 : 5, 9 : 1, 1 : 9, 5 : 4

MARKS App · Accepted Answer

Given A 1 = A 2 and K 1 K 2 = 5 4 R 1 = R 2 ⇒ l 1 K 1 A = l 2 K 2 A ⇒ l 1 l 2 = K 1 K 2 ⇒ l 1 l 2 = 5 4

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