It appears you would like me to solve the problem from the previous images. To clarify, here's a breakdown of what needs to be solved:

### **The Problem from the Image:**

The given amplifier circuit appears to be a **common-base amplifier**, and the question includes several parts related to it:
1. **i. Identify the type of amplifier.**
2. **ii. What is the mode of biasing?**
3. **iii. State the echelon of the voltage.**
4. **iv. Write an expression for \( \alpha_{dc} \), \( \alpha_{ac} \), and \( I_C \).**

I have already identified the type of amplifier and its mode of biasing. Let's proceed with solving the mathematical expressions related to \( \alpha_{dc} \), \( \alpha_{ac} \), and \( I_C \).

### **Solution Approach**

1. **Expression for \( \alpha_{dc} \) and \( \alpha_{ac} \):**
   - \( \alpha_{dc} \) is the **DC current gain** of the transistor. It represents the fraction of the emitter current \( I_E \) that is collected by the collector current \( I_C \). The formula is:
     \[
     \alpha_{dc} = \frac{I_C}{I_E}
     \]
   - In most cases, \( \alpha_{ac} \), the **AC current gain**, is the same as \( \alpha_{dc} \), because the same ratio applies to both DC and small-signal (AC) conditions.
     \[
     \alpha_{ac} = \frac{I_C}{I_E}
     \]

2. **Expression for \( I_C \) (Collector Current):**
   - The **collector current** \( I_C \) can be derived from the **emitter current** \( I_E \) and the current gain \( \alpha \):
     \[
     I_C = \alpha I_E
     \]
   Where \( \alpha \) is close to 1 in most transistors (typically 0.98 to 0.99).

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If you're given specific values for \( I_E \) or \( \alpha \) in your circuit, I can plug them in to calculate the actual values of \( \alpha_{dc} \), \( \alpha_{ac} \), and \( I_C \). Otherwise, the expressions above are the general formulas to use in solving this type of problem.

Would you like to provide specific values to proceed with solving this numerically? Or should I walk you through a more detailed example based on assumed values?

Learn how to solve common-base amplifier problems, including how to derive expressions for current gain (αdc, αac) and collector current (Ic). This solution provides step-by-step guidance suitable for electrical engineering students and professionals.

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