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Two carnot engines A and B are operated...

Two carnot engines A and B are operated in series . The engine A receives heat from the source at temperature `T_1` 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 `T_2` . For what value of T the efficiences of the two engines are equal?

A

`(T_1+T_2)/2`

B

`(T_1-T_2)/2`

C

`T_1T_2`

D

`sqrt(T_1T_2)`

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