Solved: PHYSICS Question for NEET

NEET PHYSICSMedium

The voltage gain of an amplifier with $9\%$ negative feedback is $10$ . The voltage gain without feedback will be:

1.25

100

Identify the Given Data: Voltage gain with feedback, $A_f = 10$ Feedback fraction, $\beta = 9\% = 0.09$
State the Formula: The formula for the voltage gain of an amplifier with negative feedback is given by: $A_f = \frac{A}{1 + A\beta}$ where $A$ is the voltage gain without feedback.
Perform the Calculation: Substitute the given values into the formula: $10 = \frac{A}{1 + A(0.09)}$ $10(1 + 0.09A) = A$ $10 + 0.9A = A$ $A - 0.9A = 10$ $0.1A = 10$ $A = \frac{10}{0.1} = 100$
Conclusion: The voltage gain without feedback is $100$ .

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