CUET · PHYSICS · PYQ PAPER 2023

Which of the following is true ?
(A) The equilibrium of a charged particle under the action of coulomb force alone can never be stable.
(B) A hollow metal sphere placed on an insulating stand is charged positively. The electric potential inside is same as on surface
(C) A free electron and a free proton are placed in a uniform field, both will experience same magnitude of the force
(D) A free electron and a free proton are placed in a uniform field, both will experience same acceleration
Choose the correct answer from the options given below :

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

Verified Solution

Answer & Solution

Correct Answer

(C) (A), (B) and (C) Only

Step-by-step Solution

Detailed explanation

(A) True. By Earnshaw's Theorem. (B) True. Inside a charged conductor, \( E=0 \), so potential is constant and equals surface potential. (C) True. \( F = |q|E \). \( |q_{electron}| = |q_{proton}| = e \). (D) False. \( a = F/m \). \( m_{electron} \neq m_{proton} \). Correct…

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.

Same subject

Match List-I with List-II for convex lens (symbols have their usual meanings)

List-I (Frequency Range)	List-II (EM Waves)
(A) \(4 \times 10^{14} Hz-7.5 \times 10^{14} Hz\)	(l) Infrared rays
(B) \(3 \times 10^{17} Hz-3 \times 10^{20} Hz\)	(II) Microwaves
(C) \(3 \times 10^9 Hz-3 \times 10^{11} Hz\)	(III) Visible Light
(D)\(3 \times 10^{11} Hz-4 \times 10^{14} Hz\)	(IV) X-rays

Choose the correct answer from the options given below :

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