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Two small identical… (Class 12 Physics SQP 2025-26, Q9)

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

CBSE Class 12 Physics sample paper 2025-26: question 9

From the official CBSE sample question paper for 2025-26, section A, question 9, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q9 · 1 mark · MCQElectromagnetic Induction

Two small identical magnets are allowed to fall freely one through a vertical solenoid of 20 m made up of copper and another in air through the same vertical distance. The time taken by the two magnets to fall will be

  1. (A)same in both the cases.
  2. (B)more for the magnet falling in air.
  3. (C)more for the magnet falling through the solenoid.
  4. (D)infinite.

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

Is any emf induced when a magnet moves through a coil?

Hint 2

What does Lenz's law say about the effect of the induced current?

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. The falling magnet changes the flux through the copper solenoid, which induces currents in it.

  2. By Lenz's law these induced currents oppose the magnet's motion, so the magnet falls with acceleration less than and takes longer. Option (C).

    1 mark

Answer: Option (C)

Where the marks are

  • Uses electromagnetic induction and Lenz's law opposition (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Electromagnetic Induction, 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.