A pn junction diode is forward biased when
Correct answer: A. the p side is connected to the positive terminal and the n side to the negative
- A. the p side is connected to the positive terminal and the n side to the negative
- B. the n side is connected to the positive terminal
- C. both sides are connected to the same terminal
- D. no voltage is applied
Explanation
Connecting positive to p repels holes and negative to n repels electrons, driving both towards the junction, so the depletion layer narrows and current flows once the applied voltage exceeds the barrier. Reverse bias does the opposite, widening the layer so that only a tiny leakage current passes. This one way behaviour is what makes the diode useful.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
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.
Practise Electronics
660 free Electronics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More PN Junction questions
The depletion region of a pn junction is a layer that
The majority charge carriers in a p type semiconductor are
A semiconductor doped with a pentavalent impurity such as phosphorus becomes
In reverse bias, the current through an ideal diode is
The barrier potential across an unbiased silicon pn junction is about
A Zener diode is normally operated