A charged particle is projected along the axis of a current carrying loop. Which of the following statements is true? (A) The acceleration of the charged particle will depend on the velocity with which it is projected. (B) The acceleration of the charged particle will depend on the magnitude of the current passing through the coil. (C) The acceleration of the charged particle will depend on the radius of the coil. (D) The charged particle will move with constant velocity.

PhysicsCBSE Class 12 · Sample paper, session 2025-26 · 1 mark · MCQ

CBSE Class 12 Physics sample paper 2025-26: question 8

From the official CBSE sample question paper for 2025-26, section A, question 8, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q8 · 1 mark · MCQMoving Charges and Magnetism

A charged particle is projected along the axis of a current carrying loop. Which of the following statements is true?

(A)The acceleration of the charged particle will depend on the velocity with which it is projected.
(B)The acceleration of the charged particle will depend on the magnitude of the current passing through the coil.
(C)The acceleration of the charged particle will depend on the radius of the coil.
(D)The charged particle will move with constant velocity.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2025-26.

Hints

Open one hint at a time and try again before the next.

Hint 1

What is the direction of $B$ on the axis of a loop?

Hint 2

Evaluate $q v \times B$ when $v$ is parallel to $B$ .

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

On the axis of a current loop, the magnetic field $B$ points along the axis.
The velocity is parallel to $B$ , so $F = q (v \times B) = 0$ . There is no acceleration and the particle moves with constant velocity. Option (D).
1 mark

Answer: Option (D)

Where the marks are

Notes that $v ∥ B$ , so the force is zero and the velocity stays constant (1 mark)

Revise the chapter

Chapter: Moving Charges and Magnetism (notes, formulas, where marks are lost and every past question)
Topic: Torque on a Current Loop and Magnetic Dipole

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CBSE Class 12 Physics sample paper 2025-26: question 8

Hints

Step-by-step solution

Revise the chapter

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