CUET · PHYSICS · PYQ PAPER 2025

There are two electric charges, \( Q_1 \) and \( Q_2 \), placed in vacuum. Identify the correct statements from the following
1. There will be an electrostatic force between them.
2. If these charges are placed in water, the force between them will increase.
3. The electrostatic force between them is a conservative force.
4. If both of the charges are doubled as \( 2Q_1 \) and \( 2Q_2 \), then the force between them will become 4 times.
Choose the correct answer from the options given below:

A (A) and (D) only
B (A), (C) and (D) only
C (A) and (C) only
D (A), (B) and (C) only

Verified Solution

Answer & Solution

Correct Answer

(B) (A), (C) and (D) only

Step-by-step Solution

Detailed explanation

1. Correct. 2. \( F_{medium} = \frac{F_{vacuum}}{\epsilon_r} \). For water, \( \epsilon_r > 1 \), so force decreases. Incorrect. 3. Correct. 4. \( F' = k \frac{(2Q_1)(2Q_2)}{r^2} = 4 k \frac{Q_1 Q_2}{r^2} = 4F \). Correct. Correct statements are 1, 3, and 4 (A, C, and D). (A),…

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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