Physics 2004 JAMB Past Questions - Question 26: in a reverse biased junction diode,currents flows in by

Correct Answer

D

Explanation

In a reverse biased junction diode only a very small current flows in, carried by the minority carries which are negative in the p- semi conductorsIn a reverse-biased junction diode, very little current flows in the direction of the arrow of the diode symbol. Instead, the majority of the current is blocked or impeded. This is because in a reverse bias condition, the voltage applied to the diode creates a potential barrier that prevents the flow of charge carriers (electrons for an N-type semiconductor and holes for a P-type semiconductor) across the junction.

In other words, the reverse-biased diode acts as an insulator, and only a tiny leakage current, known as the reverse current or reverse leakage current, can flow. This current is on the order of microamperes or even smaller, and it is primarily due to minority charge carriers and thermal effects. The reverse current is typically very low and is considered negligible in most practical applications.