CBSE 2023 · Region 4 · Set 1 · Q18 · 1 mark
Assertion (A) : In 'n' type semiconductor, number density of electrons is greater than the number density of holes but the crystal maintains an overall charge neutrality. Reason $\displaystyle (R)$ : The charge of electrons donated by donor atoms is just equal and opposite to that of the ionised donor.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Semiconductor Electronics: Materials, Devices and Simple CircuitsExtrinsic SemiconductorAnalyseassertion_reasonmedium
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CBSE Class 12 Physics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.