Two Carnot engines A and B are operated in series. The engine A receives heat from the source at temperature T1 and rejects the heat to the sink at temperature T. The second engine B receives the heat at temperature T and rejects to its sink at temperature T2. For what value of T the efficiences of the two engines are equal

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T1T2

answer is C.

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Detailed Solution

For the first engine,For the second engine,Since ,

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