Why does the Brownian ratchet have Carnot cycle efficiency?

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rohitupreti
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In feynman's description for the ratchet pawl system he gets the efficiency for the system to be same as he efficiency in the carnot cycle. I am not able to understand or if its correct that the process could be visualized as carnot cycle. Pls explain.
 

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Welcome to PF;
it is not the same process as a carnot cycle - it just has the same efficiency.
 

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