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Assertion (A) : Direction of… (Class 10 Science 2026, Q32)

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ScienceCBSE Class 10 · Board exam 2026, set 31/2/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2026: question 32

Set in the CBSE Class 10 board exam of 2026, paper 31/2/1, section C, question 32, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q32 · 1 mark · Assertion-reasonCompetency-basedMagnetic Effects of Electric Current

Assertion (A) : Direction of force exerted on a current-carrying conductor placed in a magnetic field remains same if the directions of both magnetic field and current flowing through the conductor are reversed.
Reason (R) : The direction of force exerted on a current-carrying conductor placed in an external magnetic field can be determined by using magnetic compass.

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

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/2/1.

Hints

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

Hint 1

What happens to the force if only one quantity is reversed?

Hint 2

Which rule gives the direction of the force on a conductor?

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. Assertion: reversing both the field and the current reverses the force twice, so its direction stays the same. True.

  2. Reason: the direction of the force is found using Fleming's left-hand rule, not a magnetic compass. False. Option (C).

    1 mark

Answer: Option (C)

Where the marks are

  • A true, R false (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Magnetic Effects of Electric Current, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 31/2/1: 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.