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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How is Q2/Q1 equal to T2/T1 for a Carnot engine? Heat and temperature are directly proportional, but how can they or their ratios be equal? - Quora

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