Which one of the following represents forward bias diode?

Options

A.
B.
C.
D.

Answer

To determine which option represents a forward-biased diode, we need to understand the concept of forward bias in a PN junction diode.

### Step-by-Step Solution:

1. **Understanding Forward Bias**:
- A diode is said to be in forward bias when the P-type side (anode) is connected to a higher potential than the N-type side (cathode). This allows current to flow through the diode.

2. **Identifying the P and N Sides**:
- In the options provided, we need to identify which side is the P-side and which is the N-side. Typically, the P-side is marked with a positive voltage and the N-side with a negative voltage.

3. **Analyzing the Voltage Across Each Option**:
- For each option, we will compare the voltages on the P-side and N-side:
- **Option A**: P-side = 0V, N-side = -2V
- Here, 0V (P-side) is greater than -2V (N-side). This indicates forward bias.
- **Option B**: P-side = -4V, N-side = -3V
- Here, -4V (P-side) is less than -3V (N-side). This indicates reverse bias.
- **Option C**: P-side = -2V, N-side = +2V
- Here, -2V (P-side) is less than +2V (N-side). This indicates reverse bias.
- **Option D**: P-side = 3V, N-side = 5V
- Here, 3V (P-side) is less than 5V (N-side). This indicates reverse bias.

4. **Conclusion**:
- Based on the analysis, only **Option A** (P-side = 0V and N-side = -2V) satisfies the condition for forward bias. Therefore, it represents a forward-biased diode.

### Final Answer:
**Option A** represents a forward-biased diode.