CUET · PHYSICS · PYQ PAPER 2023

For a transistor, which of the following statement is true ?

A Emitter is the smallest region of a transistor
B The emitter junction is forward biased and the collector junction is reverse biased
C The emitter junction is reverse biased and the collector junction is forward biased
D The collector region has the heaviest doping

Verified Solution

Answer & Solution

Correct Answer

(B) The emitter junction is forward biased and the collector junction is reverse biased

Step-by-step Solution

Detailed explanation

For a transistor to operate in its active region, the emitter-base junction must be forward biased to allow charge carriers to flow into the base, while the collector-base junction is reverse biased to "collect" those carriers. B) The emitter junction is forward biased and the…

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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