If \( N_{A} \) is number density of acceptor atoms added and \( N_{D} \) is number density of do....

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If \( N_{A} \) is number density of acceptor atoms added and
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\( N_{D} \) is number density of donor atoms added to a
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semiconductor, \( n_{e} \) and \( n_{h} \) are the number density of electrons and holes in it, then
(1) \( n_{e}=N_{D}, n_{h}=N_{A} \)
(2) \( n_{e}=N_{A}, n_{h}=N_{D} \)
(3) \( n_{e}+N_{D}=n_{h}+N_{A} \)
(4) \( n_{e}+N_{A}=n_{h}+N_{D} \)


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