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 does not rise linearly; it typically rises exponentially after the knee voltage (threshold voltage).ii. Reverse bias current is not absolutely zero; there is always a small leakage current due to the minority carriers and surface effects.iii. When a diode is forward biased, the depletion region narrows due to the reduction of the potential barrier. It is not unchanged.Since all three statements are false, the correct option is D. none.
Hint
Recall the V-I characteristics and depletion region behavior of a p-n junction diode under forward and reverse bias.