CUET · PHYSICS · PYQ PAPER 2025

In a p-n junction, the magnitude of the drift current is lower than the magnitude of the diffusion current when the junction is

A either forward biased or reverse biased
B forward biased
C reverse biased
D under equilibrium

Verified Solution

Answer & Solution

Correct Answer

(A) either forward biased or reverse biased

Step-by-step Solution

Detailed explanation

In a forward biased p-n junction, the external voltage reduces the barrier height, significantly increasing the diffusion of majority carriers across the junction. While the drift current (due to minority carriers) remains relatively constant and small, the diffusion current…

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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Match List-I with List-II

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(B) Fixes atmospheric nitrogen while free living in the soil	(II) Rhizobium
(C) Symbiotic association of fungi and plants	(III) Anabaena
(D) Cyanobacteria which can fix atmospheric nitrogen	(IV) Azotobacte

Choose the correct answer from the options given below:

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