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Analog Electronics - Engineering

Q1:

A feedback network to be used with an amplifier to provide oscillation is tested and found to give an output of 0.124 V with a 0.5 V input. What percentage negative feedback should be introduced to the amplifier so that linear oscillations result?

A 1.25%

B 2.50%

C -1.25%

D -2.5%

ANS:C - -1.25%

Please explain this in detail.