Question

When a forward bias voltage is applied to a p-n junction diode, it:

• A. Increases the potential barrier
• B. Decreases the potential barrier
• C. Increases the width of the depletion layer
• D. Converts it into an insulator

Hint:

Forward bias decreases both the depletion layer width and barrier potential, allowing current to flow easily through the diode.

Answer 1

The Correct Option is B

Concept: In forward bias, the p-side connects to the battery's positive terminal and n-side to negative. The external field opposes the built-in junction field, narrowing the depletion region and lowering the potential barrier.

Step 1: Analyse barrier behaviour.
Forward bias decreases both depletion width and barrier height, enabling majority carrier flow. Reverse bias increases them.

Final Answer: Decreases the potential barrier (option B).