Physics Electronics KU 2024
PMDC Verified Question 447 of 494
When the PN junction is reverse biased, its reverse current is of the order of:
A
Gigaamperes
B
Kiloamperes
C
Megaamperes
D
Microamperes
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Microamperes
Concept:

In a reverse-biased P-N junction, majority carriers are pulled away from the junction, widening the depletion region. However, a tiny current still leaks through due to thermally generated minority carriers.

Solution:

  • This leakage current is known as the reverse saturation current.


  • For standard semiconductor diodes (like Silicon), this current is incredibly small.


  • It is typically measured in microamperes (\( 10^{-6}\text{ A} \)) or even nanoamperes (\( 10^{-9}\text{ A} \)).


Why other options are incorrect:

  • Gigaamperes, Megaamperes, and Kiloamperes represent massive, lethal, industrial-scale currents. A tiny electronic component would instantly vaporize if subjected to such currents.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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