thermodynamics - Question about Working of a Carnot engine? - Physics Stack Exchange

In step 2 of the cycle in the carnot engine, why does the heat transfer occurs from hot reservoir to the system , even though both system and hot reservoir are at same temperature ?

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thermodynamics - Question regarding carnot engine - Physics Stack Exchange

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thermodynamics - Could a Carnot engine linked to a Carnot refrigerator create a perpetual heat flow between two reservoirs? - Physics Stack Exchange