CUET · PHYSICS · PYQ PAPER 2023

In a potentiometer, a cell is balanced at 240 cm. On shunting the cell with 2 \(\Omega\) resistance, the balancing comes at 120 cm. What is the internal resistance of the cell ?

A 4 \(\Omega\)
B 2 \(\Omega\)
C 1 \(\Omega\)
D 0.5 \(\Omega\)

Verified Solution

Answer & Solution

Correct Answer

(B) 2 \(\Omega\)

Step-by-step Solution

Detailed explanation

\( r = R \left( \frac{l_1}{l_2} - 1 \right) \) \( r = 2 \left( \frac{240}{120} - 1 \right) \) \( r = 2 (2 - 1) \) \( r = 2 (1) = 2 \Omega \)

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

List-I (Function)	List-II (Property)
(A) \(f(x)=\left\{\begin{array}{ll}\frac{x}{\|x\|} & : x \neq 0 \\ 0 & : x=0\end{array}\right.\)	(I) continuous but not differentiable at \(x=0\)
(B) \(f ( x )=\| x \|\)	(II) continuous but not differentiable at \(x=1\)
(C) \(f(x)=\left\|x^2-1\right\|\)	(III) discontinuous at \(x=0\)
(D) \(f(x)=\|x-1\|\)	(IV) continuous but not differentiable at \(x=1,-1\)

Choose the correct answer from the options given below:

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