CUET · PHYSICS · PYQ PAPER 2023

The base of transistor is:

A Heavily doped and thin.
B Moderately doped and thick.
C Lightly doped and thin.
D Lightly doped and thick.

Verified Solution

Answer & Solution

Correct Answer

(C) Lightly doped and thin.

Step-by-step Solution

Detailed explanation

The base of a transistor is made very thin and lightly doped to minimize the recombination of charge carriers. This ensures that the majority of carriers injected from the emitter can easily pass through to the collector. C) Lightly doped and thin.

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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