Question Detail
Question
Which of the following is true about a p-n junction diode?
i. Forward bias current rises linearly.
ii. Reverse bias current is absolutely zero.
iii. Width of depletion region is unchanged when forward biased.
i. Forward bias current rises linearly.
ii. Reverse bias current is absolutely zero.
iii. Width of depletion region is unchanged when forward biased.
Correct Answer
Option D is the correct answer.
Detailed Explanation
Let's analyze each statement:i. Forward bias current does not rise linearly; it rises exponentially after the knee voltage.ii. Reverse bias current is not absolutely zero; a very small leakage current (reverse saturation current) flows, and it increases significantly during avalanche or Zener breakdown.iii. When forward biased, the depletion region width decreases, allowing current to flow more easily. When reverse biased, the depletion region width increases.Therefore, none of the statements are true.
Hint
Recall the I-V characteristics and depletion region behavior of a p-n junction diode under forward and reverse bias.