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The answer is A
In the depletion layer, electrons combine with holes producing charge density so that region is depleted of charge carriers but it has charge density .
Conclusion: Neutral but still having non zero charge density .
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You can design such dialog boxes using the following website.
https://carbon.now.sh
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If a vector A is multiplied by a real number (say n), the vector of same nature is obtained but its magnitude is n times that of A.
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