In the depletion region of a diode

Question:

 In the depletion region of a diode

(a) there are no mobile charges

(b) equal number of holes and electrons exist, making the region neutral

(c) recombination of holes and electrons has taken place

(d) immobile charged ions exist

Solution:

(a) there are no mobile charges

(b) equal number of holes and electrons exist, making the region neutral

(d) immobile charged ions exist

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