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When p-n junction diode is forward biased, then

Asked in JEE Main 2004 · Depletion region and barrier potential

• (1) the depletion region is reduced and barrier height is increased
• (2) the depletion region is widened and barrier height is reduced
• (3) both the depletion region and barrier height are reduced
• (4) both the depletion region and barrier height are increased.

Step-by-step solution

Why the other options are wrong

• (1) The barrier cannot rise while the layer narrows; forward bias opposes the built-in field.
• (2) The layer narrows, not widens, in forward bias.
• (4) That is what reverse bias does.

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