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Two different metal rods of equal length...

Two different metal rods of equal lengths and equal areas of cross-section have their ends kept at the same temperature `theta_(1)` and `theta_(2)`. if `K_(1)` and `K_(2)` are their thermal conductivities, `rho_(1)` and `rho_(2)` their densities and `S_(1)` and `S_(2)` their specific heats, then the rate of flow of heat in the two rods will be the same if:

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