Discussion
What is the closed-loop gain of a negative feedback amplifier?
Answer: B
The feedback equation gives the open-loop gain divided by one plus the loop gain, which is the whole of the subject in one expression. Multiplying by the fraction gives the loop gain itself, and the remaining options describe nothing standard. Every consequence of feedback follows from this division, and it is worth being able to write it down before anything else in the topic is attempted.
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