In common base configuration of a transistor, a change of 200 mV in emitter voltage produces a change of 5 mA in emitter current. If base collector voltage `V_(CB)` remains constant, find the dynamic input resistance of transistor.

Explanation

To find the dynamic input resistance of a transistor in a common base configuration, we can follow these steps:

### Step 1: Identify the given values
We are given:
- Change in emitter voltage, \( \Delta V = 200 \, \text{mV} = 200 \times 10^{-3} \, \text{V} \)
- Change in emitter current, \( \Delta I = 5 \, \text{mA} = 5 \times 10^{-3} \, \text{A} \)

### Step 2: Understand the formula for dynamic input resistance
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