Question

When a forward bias is applied to a p-n junction. It ______.

• A. raises the potential barrier
• B. lowers the potential barrier
• C. reduces the majority carrier current to zero
• D. none of the above

Hint:

\textbf{Forward Bias} = Lower Barrier = Narrow Depletion Layer = High Current.
\textbf{Reverse Bias} = Higher Barrier = Wide Depletion Layer = Negligible Current.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Forward bias occurs when the P-side is connected to the positive terminal and the N-side to the negative terminal of a battery.
Step 2: Detailed Explanation:
In forward bias, the applied voltage opposes the built-in potential (barrier potential) of the depletion layer. This reduces the width of the depletion region and lowers the potential barrier, allowing majority carriers to diffuse across the junction easily, resulting in a large current.
Step 3: Final Answer:
The correct option is (b).