Question Detail
Question
Which of the following is true about 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 in a p-n junction diode rises exponentially, not linearly, after the cut-in voltage.ii. Reverse bias current is not absolutely zero; there is a very small leakage (reverse saturation) current due to minority carriers. At higher reverse voltages, breakdown occurs leading to a significant increase in current.iii. When a p-n junction diode is forward biased, the depletion region width decreases due to the reduction of the built-in potential barrier.Since all three statements are false, option D is the correct answer.
Hint
Recall the I-V characteristics and the behavior of the depletion region under forward bias conditions for a p-n junction diode.