CUET · PHYSICS · PYQ PAPER 2023

Choose the correct statements :
(A) If two non ideal batteries are connected in series, then equivalent emf is larger than either of the two
(B) If two non ideal batteries are connected in series, then the equivalent internal resistance is smaller than either of the two.
(C) If two non ideal batteries are connected in parallel, then the equivalent emf is smaller than either of the two
(D) If two non ideal batteries are connected in parallel then the equivalent internal resistance is smaller than the two internal resistances
Choose the correct answer from the options given below :

A (A) and (B) Only
B (A) and (D) Only
C (B) and (C) Only
D (D) Only

Verified Solution

Answer & Solution

Correct Answer

(B) (A) and (D) Only

Step-by-step Solution

Detailed explanation

For series connection: Equivalent emf: \( E_{eq} = E_1 + E_2 \). (A) is correct. Equivalent internal resistance: \( r_{eq} = r_1 + r_2 \). (B) is incorrect. For parallel connection: Equivalent emf: \( E_{eq} = \frac{E_1 r_2 + E_2 r_1}{r_1 + r_2} \). (C) is incorrect. Equivalent…

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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