Discussion
Why is the loop gain measured by breaking the loop rather than computed?
Answer: C
Stray coupling, supply impedance and layout all add paths that no calculation from the schematic would include, so a measured return ratio is the only trustworthy figure in a marginal case. The open-loop gain can be measured with care, the fraction is set by components, and the closed-loop gain is measured directly anyway. That a real loop contains more than the drawn loop is why stability problems so often surprise, and why measurement rather than analysis settles them.
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