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Draw a diagram… (Class 12 Physics SQP 2025-26, Q20II)

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PhysicsCBSE Class 12 · Sample paper, session 2025-26 · 2 marks · Very short answer

CBSE Class 12 Physics sample paper 2025-26: question 20(II)

From the official CBSE sample question paper for 2025-26, section B, question 20(II), for 2 marks. Try it first; the hints and our step-by-step solution are below.

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

Draw a diagram representing the behaviour of magnetic field lines for a
(A) diamagnetic &
(B) paramagnetic substance.

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

Think about the sign of magnetic susceptibility for each type.

Hint 2

Negative susceptibility means the material weakens the field inside it; positive means it strengthens it.

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. (A) Diamagnetic substance: draw a specimen placed in a uniform external field with the field lines bending away (repelled) around it; fewer lines pass through the specimen, so the line density inside is less than outside (field inside is weakened).

    1 mark

  2. (B) Paramagnetic substance: draw the field lines bending towards and crowding into the specimen; the line density inside is more than outside (field inside is slightly enhanced).

    1 mark

Answer: Diamagnetic: lines expelled/fewer inside; Paramagnetic: lines drawn in/concentrated inside

Where the marks are

  • Diagram showing field lines repelled from a diamagnetic specimen (1 mark)
  • Diagram showing field lines concentrated inside a paramagnetic specimen (1 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 2025-26: 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.