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An alpha particle enters a… (Class 10 Science 2023, Q16)

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ScienceCBSE Class 10 · Board exam 2023, set 31/4/1 · 1 mark · MCQ

CBSE Class 10 Science 2023: question 16

Set in the CBSE Class 10 board exam of 2023, paper 31/4/1, section A, question 16, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q16 · 1 mark · MCQMagnetic Effects of Electric Current

An alpha particle enters a uniform magnetic field as shown. The direction of force experienced by the alpha particle is :

  1. (A)towards right
  2. (B)towards left
  3. (C)into the page
  4. (D)out of the page

Figure in the paper: Horizontal arrows representing a uniform magnetic field directed to the right, labelled 'Magnetic Field'. An alpha particle (α-particle) shown moving vertically downward through the field. See it in the official paper.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/4/1.

Hints

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

Hint 1

Treat the moving positive charge as a current.

Hint 2

Apply Fleming's left-hand rule.

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.

  1. An alpha particle is positive, so its motion (downward) acts like a current in that direction.

  2. By Fleming's left-hand rule, with the field to the right and the current downward, the force is out of the page. Option (D) is correct.

    1 mark

Answer: Out of the page, option (D)

Where the marks are

  • Correct use of Fleming's left-hand rule for a positive charge (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Magnetic Effects of Electric Current, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 31/4/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.