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

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100

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1.25

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Solution

The correct option is A 100
Let the input voltage be $v_{i}$ and the output voltage be $v_{0}$
We have $v_{0} = 10 v_{i}$ and $(v_{i} - 0.09 v_{0}) A = 0.01 v_{0}$ , where $A$ is voltage gain without feedback
$\Rightarrow A = \frac{v_{0}}{0.01 v_{0}} = 100$
Therefore option $B$ is correct

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