Two rods of same length and area of cross-section A1 and A2 have their ends at the same temperature. If K1 and K2 are their thermal conductivities, c1 and c2 are their specific heats and d1 and d2 are their densities, then the rate of flow of heat is the same in both the rods if

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Two rods of same length and area of cross-section A₁ and A₂ have their ends at the same temperature. If K₁ and K₂ are their thermal conductivities, c₁ and c₂ are their specific heats and d₁ and d₂ are their densities, then the rate of flow of heat is the same in both the rods if

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$\frac{A_{1}}{A_{2}} = \frac{k_{2} c_{1} d_{1}}{k_{1} c_{2} d_{2}}$