Question: What is the main characteristic of a P-N junction in semiconductor physics?

Options:

1. It allows current to flow in both directions
2. It creates a depletion region
3. It acts as a capacitor
4. It has infinite resistance

Correct Answer: It creates a depletion region

Solution:

A P-N junction creates a depletion region where charge carriers are absent, which is crucial for its rectifying behavior.