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 - Proof of a Carnot engine being the most efficient heat engine - Physics Stack Exchange

Describe the working of a Carnot engine and mention the expression for its efficiency.