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Assertion (A): A current… (Class 10 Science 2023, Q20)

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ScienceCBSE Class 10 · Board exam 2023, set 31/4/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2023: question 20

Set in the CBSE Class 10 board exam of 2023, paper 31/4/1, section A, question 20, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q20 · 1 mark · Assertion-reasonCompetency-basedMagnetic Effects of Electric Current

Assertion (A): A current carrying straight conductor experiences a force when placed perpendicular to the direction of magnetic field.

Reason (R): The net charge on a current carrying conductor is always zero.

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

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/4/1.

Hints

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

Hint 1

Check each statement separately.

Hint 2

Is the force due to the net charge or to the 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. A conductor carrying current at right angles to a magnetic field feels the maximum force, so A is true. The net charge on a conductor is zero, so R is also true.

  2. The force arises from moving charges, not from net charge, so R does not explain A. Option (B) is correct.

    1 mark

Answer: Option (B)

Where the marks are

  • Both true but R is not the explanation (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 paper2023 board paper, set 31/4/1: 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.