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Analog Electronics - Engineering

Q1:

The voltage gains of an amplifier without feedback and with negative feedback respectively are 100 and 20. The percentage of negative feedback would be.

A 40%

B 5%

C 20%

D 80%

ANS:C - 20%

According to me, the answer should be 4%.
20 = (100)/(1+(100)(B))
B = 0.04 or 4%.