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Application of a forward bias to a p-n junction
(a) Widens the depletion zone.
(b) Increases the potential difference across the depletion zone.
(c) Increases the number of donors on the n side.
(d) Increases the electric field in the depletion zone.
(c)
Number of donors is more because electrons from -ve terminal of the cell pushes (enters) the n side and decreases the number of uncompensated pentavalent ion due to which potential barrier is reduced. Then eutralised pentavalent atom are again in position to donate electrons.
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