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The depletion layer in the p-n junction region is caused by

1. drift of holes
2. diffusion of charge carriers
3. migration of impurity ions
4. drift of electrons

Correct answer: diffusion of charge carriers

Solution

The depletion layer in a p-n junction forms due to the diffusion of charge carriers (electrons and holes) across the junction, leading to the creation of a region devoid of free charge carriers.

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