Question

Applying forward bias in a p-n junction, the potential barrier:

• A. Decreases
• B. Increases
• C. Remains unchanged
• D. Becomes zero

Hint:

In a p-n junction, applying forward bias reduces the potential barrier, allowing current to flow more easily.

Answer 1

The Correct Option is A

Step 1: Understanding p-n junction and biasing.
In a p-n junction, when a forward bias is applied (positive terminal connected to the p-type and negative terminal to the n-type), the potential barrier at the junction decreases. This allows charge carriers (electrons and holes) to move across the junction, leading to current flow.
Step 2: Effect of forward bias.
Forward bias reduces the width of the depletion region, thereby reducing the potential barrier. This enables easier flow of current through the junction.
Step 3: Conclusion.
Thus, applying forward bias in a p-n junction causes the potential barrier to decrease, corresponding to option (A).