PN junction when reversed biased act as:
Correct answer: D. OFF Switch
- A. Capacitor
- B. ON switch
- C. Inductor
- D. OFF Switch
Explanation
When a PN junction is reverse biased, it acts like an insulator or an OFF switch. This is because the majority carriers (electrons in N-type and holes in P-type) are pushed away from the junction, creating a depletion region with very few charge carriers. This effectively breaks the connection, and very little current flows through the junction. Therefore, option d is correct.
This question appeared on the KMU Centralized Admission Test 2022 paper, which you can sit online with every answer explained.
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About PN Junction
A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
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