Question

In a p-n junction diode, when it is forward biased, what happens?

• A. The potential barrier decreases
• B. The potential barrier increases
• C. There is a large current flow
• D. There is a small current flow

Hint:

In a forward-biased p-n junction, the potential barrier decreases, allowing current to flow easily across the junction.

Answer 1

The Correct Option is A

Step 1: Understanding p-n junction behavior.
When a p-n junction diode is forward biased, the positive terminal of the power source is connected to the p-type material, and the negative terminal is connected to the n-type material. This reduces the potential barrier.
Step 2: Explanation of current flow.
In forward bias, the reduced potential barrier allows current to flow easily from the p-side to the n-side. The decrease in the barrier facilitates the flow of charge carriers (electrons and holes).
Step 3: Conclusion.
When the diode is forward biased, the potential barrier decreases, allowing current to flow. Hence, the correct answer is (A).