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Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K1 and K2 and cross sectional areas A1 and A2, respectively. If the rate of heat conduction in 1 is four times that in 2, then

(a) K1A1 = 4K2A2

(b) K1A1 = 2K2A2

(c) 4K1A1 = K2A2

(d) K1A1 = K2A2

1 Answer

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Best answer

Correct option (a) K1A1 = 4K2A2

Explanation:

Let L be length of each rod. Rate of heat flow in rod 1 for the temperature difference ΔT is

Rate of heat flow in rod 2 for the same difference ΔT is

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