In which of the following figures, junction diode is forward biased?

Options

A.
B.
C.
D.

Answer

To determine in which figure the junction diode is forward biased, we need to understand the concept of forward biasing in a PN junction diode.

### Step-by-Step Solution:

1. **Identify the PN Junction**:
- A PN junction diode consists of two regions: the P-type (positive) and the N-type (negative). The P-type region has an abundance of holes (positive charge carriers), while the N-type region has an abundance of electrons (negative charge carriers).

2. **Understand Forward Biasing**:
- A diode is said to be forward biased when the P-type side is connected to a higher potential (positive voltage) than the N-type side. This allows current to flow through the diode.

3. **Analyze the Given Figures**:
- We need to look at the voltage levels in each figure and compare the potentials of the P and N sides of the diode.

4. **Determine the Voltage Conditions**:
- For each figure, we will check the voltage at the P side and the N side:
- If the voltage at the P side (V_P) is greater than the voltage at the N side (V_N), then the diode is forward biased.
- Mathematically, this can be expressed as: V_P > V_N.

5. **Evaluate Each Option**:
- **Option 0**: V_P = 0 V, V_N = -2 V → 0 > -2 (Forward biased)
- **Option 1**: V_P = -2 V, V_N = 0 V → -2 < 0 (Reverse biased)
- **Option 2**: V_P = 2 V, V_N = 5 V → 2 < 5 (Reverse biased)
- **Option 3**: V_P = 5 V, V_N = 0 V → 5 > 0 (Forward biased)

6. **Conclusion**:
- The figures that show the diode as forward biased are those where the P side voltage is greater than the N side voltage. Based on our analysis, the correct options are 0 and 3.

### Final Answer:
The junction diode is forward biased in figures 0 and 3.