CUET · PHYSICS · PYQ PAPER 2023

When an n-p-n transistor is used as an amplifier, then :

A electrons move from collector to base
B holes move from base to emitter
C electron move from base to collector
D electron move from emitter to base

Verified Solution

Answer & Solution

Correct Answer

(D) electron move from emitter to base

Step-by-step Solution

Detailed explanation

In an n-p-n transistor used as an amplifier, the emitter-base junction is forward-biased. This bias reduces the barrier potential, allowing majority carriers (electrons) to move from the emitter into the base. These electrons then diffuse through the base and are swept into 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.

Same subject

Match List-I with List-II

List-I (Motion of a charge particle)	List-II (Path)
(A) Initial velocity of charge particle parallel to B	(I) Circular Path
(B) Initial velocity of charge particle perpendicular to B	(II) Helical Path
(C) Initial velocity of charge particle inclined to B	(III) Straight Path
(D) Initial velocity of charge particle perpendicular to E	(IV) Parabolic Path

Choose the correct answer from the options given below :

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