In a....... baised pn junction , the net flow of holes is from the `n` region to the `p` region .

Options

A. Forward
B. reverse
C. no
D. Both A and B

Answer

To solve the question regarding the flow of holes in a biased pn junction, we can follow these steps:

### Step 1: Understand the Structure of a PN Junction
A pn junction consists of two types of semiconductor materials: p-type, which has an abundance of holes, and n-type, which has an abundance of electrons.

**Hint:** Remember that p-type semiconductors are rich in holes, while n-type semiconductors are rich in electrons.

### Step 2: Identify the Biasing Conditions
The behavior of the pn junction depends on whether it is forward-biased or reverse-biased. In forward bias, the p-type side is connected to the positive terminal of a voltage source, and the n-type side is connected to the negative terminal. In reverse bias, the connections are opposite.

**Hint:** Think about how the connections to the voltage source affect the movement of charge carriers in the junction.

### Step 3: Analyze Hole Movement in Reverse Bias
In reverse bias, the p-type region is connected to the negative terminal, and the n-type region is connected to the positive terminal. This causes the depletion region to widen, and the holes from the p-type region are attracted away from the junction, while electrons from the n-type region are pushed away.

**Hint:** Consider what happens to the charge carriers when the junction is reverse-biased.

### Step 4: Determine the Net Flow of Holes
In reverse bias, the net flow of holes is from the n region to the p region. This is because the holes are being drawn towards the n region due to the electric field created by the reverse bias, leading to a net movement of holes from the n region into the p region.

**Hint:** Focus on the direction of the electric field and how it influences the movement of holes and electrons.

### Conclusion
Thus, the answer to the question is that in a **reverse-biased** pn junction, the net flow of holes is from the n region to the p region.

**Final Answer:** Reverse-biased.