In the case of forward biasing of `PN`-junction, which one of the following figures correctly depicts the direction of flow of carriers?

Options

A.
B.
C.
D.

Answer

To solve the question regarding the direction of flow of carriers in a forward-biased PN junction, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Forward Biasing**:
- In a PN junction, forward biasing occurs when the positive terminal of the battery is connected to the P-type material and the negative terminal is connected to the N-type material. This reduces the potential barrier at the junction.

**Hint**: Remember that forward biasing allows current to flow easily through the diode.

2. **Carrier Movement**:
- In the P-type region, holes (positive charge carriers) are the majority carriers, while in the N-type region, electrons (negative charge carriers) are the majority carriers. When the junction is forward biased, holes from the P-side move towards the N-side and electrons from the N-side move towards the P-side.

**Hint**: Identify the majority carriers in each region: holes in P-type and electrons in N-type.

3. **Direction of Flow**:
- The movement of holes towards the N-side and electrons towards the P-side results in a flow of current. The conventional current direction is from the P-side to the N-side, which is the direction of the flow of holes.

**Hint**: Conventional current flows from positive to negative; think about how holes and electrons move.

4. **Combining with Counterparts**:
- As holes and electrons meet at the junction, they recombine. This recombination process neutralizes the charge carriers, allowing more carriers to flow across the junction.

**Hint**: Recombination is a key process in understanding how current flows in a diode.

5. **Identifying the Correct Figure**:
- Among the provided figures, the one that correctly depicts the flow of holes from the P-side to the N-side and electrons from the N-side to the P-side is the correct answer. Based on the explanation, option B is identified as the correct representation.

**Hint**: Look for arrows indicating the flow of holes and electrons in the figures.

### Conclusion:
The correct figure that depicts the direction of flow of carriers in the case of forward biasing of a PN junction is option B, where holes move towards the N-side and electrons move towards the P-side.