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What are magnetic field… (Class 10 Science 2025, Q26)

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ScienceCBSE Class 10 · Board exam 2025, set 31/4/1 · 2 marks · Very short answer

CBSE Class 10 Science 2025: question 26

Set in the CBSE Class 10 board exam of 2025, paper 31/4/1, section B, question 26, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q26 · 2 marks · Very short answerMagnetic Effects of Electric Current

What are magnetic field lines. List two important properties of magnetic field lines.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/4/1.

Hints

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

Hint 1

Think of the pattern made by iron filings around a bar magnet.

Hint 2

Consider what would happen to the field direction at a point if two lines crossed there.

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. Magnetic field lines are imaginary lines drawn around a magnet to represent its magnetic field. The tangent at any point on a line gives the direction of the field at that point.

    1 mark

  2. Property 1: No two magnetic field lines ever cross each other.

    ½ mark

  3. Property 2: Outside the magnet, field lines emerge from the north pole and merge at the south pole. They are closed curves, and inside the magnet they run from the south pole to the north pole.

    ½ mark

Answer: Magnetic field lines are imaginary lines representing the magnetic field around a magnet. They never cross, and they run from N to S outside the magnet as closed curves.

Where the marks are

  • Correct definition of magnetic field lines (1 mark)
  • Any two correct properties (½ mark each)

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 paper2025 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.