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JEE · NEET Previous Year Question

$The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be [2008]$

Topic: NEET PYQ

Answer: D. Full step-by-step solution below.

A $90$
B $10$
C $1.25$
D $100$

Correct answer: D

Solution

(d) Here, A_{fb} = 10, A = ?, m = 9 % = \frac{9}{100} As A_{fb} = \frac{A}{1 + Am} ∴ 10 = \frac{A}{1 + A \times \frac{9}{100}} On solving, A = 100

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