CUET · PHYSICS · PYQ PAPER 2023

During the p-n junction formation, when an electron diffuses from n \( \rightarrow \) p, it leaves behind an :

A Ionised acceptor on n-side
B Ionised donor on n-side
C Ionised donor on p-side
D Ionised donor on n-side and p-side both

Verified Solution

Answer & Solution

Correct Answer

(B) Ionised donor on n-side

Step-by-step Solution

Detailed explanation

When an electron from the n-type region diffuses into the p-type region, it leaves behind its parent donor atom. Since this atom has lost a negative electron, it becomes a positively charged ionised donor that is fixed in the crystal lattice on the n-side. B) Ionised donor on…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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