An amplifier with negative feedback has overall gain of 100. The percentage change in gain with feedback and without feedback is 3% and 18% respectively. What is the feedback factor?
- A. 0.05
- B. 0.02
- C. 0.04
- D. 0.10
Answer: C. 0.04
Explanation: Excluded from evaluation by ISRO due to numerical mismatch in options: dAf/Af = (1/(1+Aβ))·(dA/A) gives 1 + Aβ = 18%/3% = 6, yielding feedback factor β ≈ 0.0083.