Compute the feedback ratio, Physics

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Q. When the negative feedback is practical to an amplifier of gain 50 the gain falls to 25. Compute the feedback ratio?

Af = A / 1 + Aβ

25 = 50 / 1 + 50 β

1 = 2 / 1 + 50 β

1 + 50 β = 2 (i.e) 50 β = 1

β = 1 /50 = 0.02

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