For a forward-biased p-n junction, the depletion-region width W varies with applied voltage Va as which?
AW stays constant under any forward Va always
BW increases linearly with forward applied Va
CW decreases as Va grows (Vbi - Va shrinks)
DW follows exp(Va) growth under all conditions
Answer & Solution
Correct answer: C. W decreases as Va grows (Vbi - Va shrinks)
W ∝ √(Vbi - Va) for p-n (one-sided approximation). Forward bias reduces (Vbi - Va), narrowing the depletion region. Reverse bias widens it.
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