CUET · PHYSICS · PYQ PAPER 2023

When a p-n junction is forward biased, the width of depletion region

A decreases
B increases
C remains same
D first increases then decreases

Verified Solution

Answer & Solution

Correct Answer

(A) decreases

Step-by-step Solution

Detailed explanation

In forward bias, the external voltage pushes majority carriers (holes and electrons) towards the junction. This neutralizes some of the ions in the depletion layer, causing its width to shrink and the potential barrier to lower. A) decreases

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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LIST I	LIST II
A. Brackett series	I. Visible region
B. Balmer series	II. Ultraviolet region
C. Paschen series	III. far infrared region
D. Lyman series	IV. infrared region

List-I	List-II
(A) value of \(k\)	(I) \(\frac{16}{25}\)
(B) \(P(x \geq 2)\)	(II) \(\frac{9}{25}\)
(C) \(P(X=3)\)	(III) \(\frac{4}{25}\)
(D) \(P(X<2)\)	(IV) \(\frac{8}{25}\)

X	0	1	2	3	4
P(X)	0.2	k	k	2k	k