In an unbiased p-n junction, if dope concentration in p-region is more than that in n-region, then
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a
diffusion current flows from n-region to p-region
b
drift current flows from n-region to p-region.
c
electric field in the depletion layer is directed from p-region to n-region.
d
depletion layer penetrates the n-region more deeply than the p-region.
answer is D.
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Detailed Solution
Concentration of holes in the p-region is more than the concentration of free electrons in the n-region Electrons diffuse into p-region, they recombine with holes in extremely narrow region near the interface of p and n regions. Hence option (4) is right.