If the two ends of a p-n junction are joined by a wire .

Options

A. there will not be a steady current in the circuit
B. there will be a steady current from the n-side to the p-side
C. there will a steady current from the p-side to the n-side
D. there may or nay not be a current depending upon the resistance of the connecting wire.

Answer

To solve the question regarding the behavior of a p-n junction when its ends are connected by a wire, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the p-n Junction**:
- A p-n junction is formed by joining p-type and n-type semiconductors. The p-side has an abundance of holes (positive charge carriers), while the n-side has an abundance of electrons (negative charge carriers).

2. **Depletion Region**:
- At the junction, there is a region called the depletion region, where the majority carriers (holes in p-side and electrons in n-side) recombine, leaving behind charged ions (positive on the p-side and negative on the n-side). This creates an electric field that opposes further movement of charge carriers.

3. **Connecting the Wire**:
- When the two ends of the p-n junction are connected by a wire (without a battery), the circuit is closed, but there is no external voltage applied to drive the current.

4. **Current Flow**:
- In a p-n junction, there are two types of currents:
- **Drift Current**: Caused by the movement of minority carriers (electrons in p-side and holes in n-side).
- **Diffusion Current**: Caused by the movement of majority carriers (holes in p-side moving to n-side and electrons in n-side moving to p-side).

5. **Opposing Currents**:
- The drift current and diffusion current will flow in opposite directions. The drift current will flow from the n-side to the p-side, while the diffusion current will flow from the p-side to the n-side.

6. **Net Current**:
- Since the drift and diffusion currents oppose each other, they will cancel each other out. Therefore, there will be no net steady current flowing through the circuit when connected by a wire.

7. **Conclusion**:
- The correct answer is that there will be no steady current in the circuit when the two ends of a p-n junction are connected by a wire.

### Final Answer:
**There will be no steady current in the circuit.**