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A certain magnetic… (Class 12 Physics SQP 2026-27, Q20A)

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PhysicsCBSE Class 12 · Sample paper, session 2026-27 · 2 marks · Very short answer

CBSE Class 12 Physics sample paper 2026-27: question 20(A)

From the official CBSE sample question paper for 2026-27, section B, question 20(A), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q20(A) · 2 marks · Very short answerMagnetism and Matter

A certain magnetic substance is found to have a relative permeability of 800. What type of magnetic material is it? Write any two characteristics that such a material exhibits.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.

Hints

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

Hint 1

Compare μr with 1: slightly less, slightly more, or much more?

Hint 2

Recall how iron behaves near a magnet and after the magnet is removed.

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. Since , the substance is ferromagnetic (e.g., iron, cobalt, nickel).

    1 mark

  2. Characteristic 1: It is strongly attracted by a magnet and moves from weaker to stronger regions of a non-uniform field; its susceptibility is large and positive.

    ½ mark

  3. Characteristic 2: It retains magnetism after the external field is removed (shows hysteresis / retentivity), so it can be made into a permanent magnet; it becomes paramagnetic above the Curie temperature.

    ½ mark

Answer: Ferromagnetic material

Where the marks are

  • Identifies material as ferromagnetic since μr ≫ 1 (1 mark)
  • Any two correct characteristics (½ + ½ mark)

Revise the chapter

Practise this chapterBoard-style questions from Magnetism and Matter, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2026-27: 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.