Question

In a p-n junction diode, what happens to the width of the depletion region when the forward bias is increased?

• A. It increases.
• B. It decreases.
• C. It remains the same.
• D. It first increases and then decreases.

Hint:

A forward bias reduces the potential barrier at the p-n junction, allowing current to flow and reducing the width of the depletion region.

Answer 1

The Correct Option is B

In a p-n junction diode, the depletion region is formed due to the diffusion of charge carriers across the junction, creating a region with no mobile charge carriers. When a forward bias is applied, the potential barrier is reduced, causing the width of the depletion region to decrease. As the forward bias increases, the electric field due to the bias overcomes the barrier, reducing the width of the depletion region. Thus, when the forward bias is increased, the width of the depletion region decreases.