Based on the provided source answer, the expected answer is Infinite. However, this conflicts with the standard ideal op-amp model, where the output impedance is zero.
Output impedance of inverting op-amp is
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Question context
This question is part of ⚡ Electrical Engineering within the broader 🛠️ Engineering Essentials subject and appears in the PTS Pakistan Testing Service preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.