Target Exam

CUET

Subject

Physics

Chapter

Semiconductors and Electronic Devices

Question:

When a p-n junction is reverse biased:

Options:

Width of depletion region decreases

The drift of electrons and holes stops.

Potential barrier decreases

The diffusion of electrons and holes stops

Correct Answer:

The diffusion of electrons and holes stops

Explanation:

The correct answer is Option (4) → The diffusion of electrons and holes stops

In a reverse-biased p-n junction, the positive terminal of the battery is connected to the n-side and the negative terminal to the p-side. This increases the potential barrier, widens the depletion region, and prevents the diffusion of charge carriers across the junction. The drift of electrons and holes continues due to the internal electric field.

Answer: The diffusion of electrons and holes stops