Target Exam

CUET

Subject

Physics

Chapter

Semiconductors and Electronic Devices

Question:

In a p-n junction, the magnitude of the drift current is lower than the magnitude of the diffusion current when the junction is

Options:

either forward biased or reverse biased

forward biased

reverse biased

under equilibrium

Correct Answer:

forward biased

Explanation:

The correct answer is Option (2) → forward biased **

$\text{In a p-n junction:}$

$\text{Drift current is due to minority carriers, diffusion current is due to majority carriers.}$

$\text{At equilibrium: diffusion current = drift current in magnitude.}$

$\text{When forward biased: diffusion current increases, drift current remains nearly the same.}$

$\text{When reverse biased: drift current dominates, diffusion current decreases.}$

$\text{Hence, magnitude of drift current is lower than diffusion current when the junction is forward biased.}$

$\text{Answer: forward biased}$