The overall gain of a multistage amplifier is 100. When negative feedback is applied, the gain reduces to 10. Find the fraction of the output that is feedback to the input.

Explanation

To find the fraction of the output that is fed back to the input in a multistage amplifier with negative feedback, we can follow these steps:

### Step 1: Understand the Given Information
We know the following:
- Gain without feedback (\(A_v\)) = 100
- Gain with feedback (\(A_{vf}\)) = 10

### Step 2: Write the Formula for Gain with Feedback
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