CUET · PHYSICS · PYQ PAPER 2025
Identify the incorrect statements from the following.
(A) A charged particle of charge e is moving through a magnetic field, work will be done by the magnetic field on the charge.
(B) A conductor with free electrons is placed in a magnetic field. No current is flowing through the conductor. No magnetic force acts on the conductor.
(C) A charged particle is moving perpendicular to the magnetic field. The magnetic force does not change the speed of the particle but changes its direction.
(D) A charged particle is moving in a straight direction without any change of direction. It shows that no magnetic field is there.
Choose the correct answer from the options given below:
- A (A) and (B) only
- B (A) and (C) only
- C (C) and (D) only
- D (A) and (D) only
Answer & Solution
Correct Answer
(D) (A) and (D) only
Step-by-step Solution
Detailed explanation
(A) Incorrect: The magnetic force \((F=q(v \times B))\) is always perpendicular to the velocity of the particle. Since work is defined as \(W=F\) and the force is perpendicular to displacement, the work done by a magnetic field on a moving charge is always zero. (D) Incorrect: A…
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