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A rectangular coil of area A… (Class 12 Physics 2025, Q3)

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PhysicsCBSE Class 12 · Board exam 2025, set 55/7/1 · 1 mark · MCQ

CBSE Class 12 Physics 2025: question 3

Set in the CBSE Class 12 board exam of 2025, paper 55/7/1, section A, question 3, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q3 · 1 mark · MCQElectromagnetic Induction

A rectangular coil of area A is kept in a uniform magnetic field such that the plane of the coil makes an angle with . The magnetic flux linked with the coil is :

  1. (A)BA sin
  2. (B)BA cos
  3. (C)BA
  4. (D)zero

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 55/7/1.

Hints

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

Hint 1

Flux depends on the angle between and the area vector.

Hint 2

The area vector is perpendicular to the plane of the coil.

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. Flux is , where is the angle between and the normal to the coil. The normal makes an angle with .

    ½ mark

  2. So .

    ½ mark

Answer: BA sin α, option (A)

Where the marks are

  • Uses the angle with the normal, , to get (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 paper2025 board paper, set 55/7/1: 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.