For a transistor , the correct statement is

Options

A. Collector current increases with increase in emitter current
B. Collector current decreases with increase in emitter current
C. Collector current increases with decrease in emitter current
D. Collector current decreases with decrease in emitter current

Answer

To solve the question regarding the correct statement about a transistor, we need to analyze the relationship between the emitter current (IE), collector current (IC), and base current (IB) in a transistor.

### Step-by-step Solution:

1. **Understanding Transistor Operation**:
- A transistor has three terminals: the emitter (E), base (B), and collector (C).
- The relationship between the currents in a transistor can be expressed as:
\[ I_E = I_C + I_B \]
- This equation states that the emitter current (IE) is the sum of the collector current (IC) and the base current (IB).

2. **Analyzing the Collector Current**:
- The collector current (IC) is primarily controlled by the base current (IB) in a transistor.
- When the base current increases, the collector current also increases, assuming the transistor is in active mode.

3. **Considering the Emitter Current**:
- The emitter current (IE) is the total current flowing out of the emitter.
- If the emitter current increases, it implies that either the collector current or the base current (or both) must also increase.

4. **Evaluating the Statements**:
- **Statement 1**: Collector current increases with an increase in emitter current. (True)
- **Statement 2**: Collector current decreases with an increase in emitter current. (False)
- **Statement 3**: Collector current increases with a decrease in emitter current. (False)
- **Statement 4**: Collector current decreases with a decrease in emitter current. (True)

5. **Conclusion**:
- The correct statements regarding the relationship between collector current and emitter current are:
- Collector current increases with an increase in emitter current.
- Collector current decreases with a decrease in emitter current.

### Final Answer:
The correct statements are:
- Collector current increases with an increase in emitter current.
- Collector current decreases with a decrease in emitter current.