Question
The sequence of physical events when forward bias is applied to PN junction:
A. Barrier potential reduces
B. Majority carriers injected across junction
C. Recombination in neutral regions increases
D. Diffusion current established across quasi-neutral regions
E. Net forward current increases
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
A, B, D, C, E
When forward bias is applied to a PN junction, a series of physical events occurs that influence the behavior of the junction. Let's analyze these events step-by-step to understand the correct sequence:
- A. Barrier potential reduces: \(V\) is the built-in potential (barrier potential) at the junction. When forward bias is applied, this potential barrier reduces, allowing carriers to move more freely across the junction.
- B. Majority carriers injected across junction: With the reduction of the barrier potential, majority carriers (i.e., electrons in the N-region and holes in the P-region) gain sufficient energy to overcome the barrier and move across the junction.
- D. Diffusion current established across quasi-neutral regions: As majority carriers move across the junction, they diffuse into the opposite regions. This establishes a diffusion current across the quasi-neutral regions in the semiconductor material.
- C. Recombination in neutral regions increases: As the injected carriers (electrons and holes) move into the neutral regions, recombination occurs. This recombination process increases due to the high availability of carriers from forward bias injection.
- E. Net forward current increases: The result of these actions is an increase in the net forward current as carriers recombine and current flow increases through the device.
Hence, the correct answer is A, B, D, C, E.
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