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Q.

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.
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In an unbiased p-n junction, if dope concentration in p-region is more than that in n-region, then