In \( n \) - type semiconductor when all donor states are filled, t...

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In \( n \) - type semiconductor when all donor states are filled, then the net charge density in the donor states
\( \mathrm{P} \)
becomes:
W
(1) 1
(2) \( 1 \), but not zero
(3) \( 1 \)
(4) zero
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