Question

Diffusion current in a p-n junction is greater than the drift current in magnitude: 
 

• A. if the junction is forward biased
• B. if the junction is reverse biased
• C. if the junction is unbiased
• D. in none of them

Hint:

In reverse bias, the diffusion current is greater than the drift current due to the widening of the depletion region.

Answer 1

The Correct Option is B

In a p-n junction, the diffusion current is due to the movement of charge carriers from high concentration to low concentration, whereas the drift current arises due to the presence of an electric field. When the junction is reverse biased, the depletion region widens, increasing the diffusion current compared to the drift current.