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Assertion (A) : Induced emf… (Class 12 Physics 2026, Q13)

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PhysicsCBSE Class 12 · Board exam 2026, set 55/5/1 · 1 mark · Assertion-reason

CBSE Class 12 Physics 2026: question 13

Set in the CBSE Class 12 board exam of 2026, paper 55/5/1, section A, question 13, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q13 · 1 mark · Assertion-reasonCompetency-basedElectromagnetic Induction

Assertion (A) : Induced emf produced in a coil will be more when the magnetic flux linked with the coil is more.
Reason (R) : Induced emf produced is directly proportional to the magnetic flux.

  1. (A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  2. (B)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  3. (C)Assertion (A) is true, but Reason (R) is false.
  4. (D)Both Assertion (A) and Reason (R) are false.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 55/5/1.

Hints

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

Hint 1

State Faraday's law.

Hint 2

Does a large but constant flux induce any emf?

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. By Faraday's law, . The induced emf depends on the rate of change of flux, not on the flux itself.

  2. A large flux that is not changing produces no emf, so both A and R are false.

    1 mark

Answer: Option (D)

Where the marks are

  • Recognises emf ∝ rate of change of flux, so both are false (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 paper2026 board paper, set 55/5/1: 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.