A) free electrons in the n-region attract them.
B) they move across the junction by the potential difference.
C) hole concentration in p-region is more as compared to n-region.
D) All the above.
Correct Answer: C
Solution :
Option [c] is correct. Explanation: The diffusion of charge carriers across a junction takes place from the regions of higher concentration to lower concentration. In this case, the p-region has greater concentration of holes than the n-region. Hence, in an unbiased p-n junction, holes diffuse from the p-region to the n-region.
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