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    Question

    In a reverse-biased p-n junction diode, which of the

    following occurs as reverse voltage increases?
    A Depletion width increases, barrier height increases Correct Answer Incorrect Answer
    B Depletion width decreases, barrier height increases Correct Answer Incorrect Answer
    C Depletion width increases, barrier height decreases Correct Answer Incorrect Answer
    D Both depletion width and barrier height decrease Correct Answer Incorrect Answer

    Solution

    In a reverse-biased p-n junction diode , the applied reverse voltage pulls electrons and holes away from the junction, increasing the electric field across the depletion region. This leads to the following effects:

    • Depletion width increases : More charge carriers are swept away from the junction, widening the depletion region.
    • Barrier height increases : The potential barrier becomes harder for carriers to overcome, as the external reverse voltage adds to the built-in potential.
    This is the typical behaviour of a reverse-biased diode.

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