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Answer the following. (Class 10 Science 2026, Q37)

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ScienceCBSE Class 10 · Board exam 2026, set 31/1/1 · 3 marks · Short answer

CBSE Class 10 Science 2026: question 37

Set in the CBSE Class 10 board exam of 2026, paper 31/1/1, section C, question 37, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q37 · 3 marks · Short answerMagnetic Effects of Electric Current

Answer the following.

  1. (a)

    The pattern of magnetic field due to a current carrying wire depends upon the shape made by that wire. Justify.

    3 marks
  2. (b)

    A current carrying straight wire AB is shown in the given diagram. Out of X, Y and Z on which point will the strength of magnetic field be maximum and why?

    0 marks

Figure in the paper: A vertical straight wire AB with A at top and B at bottom; electric current i is shown flowing upward from B to A. A horizontal dashed line to the right of the wire marks three points X, Y and Z, with X closest to the wire, Y in the middle and Z farthest. See it in the official paper.

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

Hints

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

Hint 1

Compare the field lines around a straight wire, a circular loop and a solenoid.

Hint 2

For (b), think about how the field strength changes as you move away from a straight wire.

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) Straight wire: the field lines are concentric circles centred on the wire, lying in a plane perpendicular to it. Draw a vertical wire with circles around it and arrows given by the right-hand thumb rule.

    1 mark

  2. (a) Circular loop: near the wire the lines are concentric circles. Towards the centre they become nearly straight and parallel. Solenoid: the pattern is like a bar magnet, with parallel straight lines (a uniform field) inside. Drawing any two of these patterns shows that the field pattern changes with the shape of the wire.

    1 mark

  3. (b) The field will be maximum at X.

    ½ mark

  4. (b) Reason: the strength of the magnetic field of a straight current-carrying wire decreases as the distance from the wire increases. X is the point closest to the wire.

    ½ mark

Answer: (a) Straight wire gives concentric circles; loop gives circles that become straight near the centre; solenoid gives a bar-magnet-like pattern (any two). (b) At X, because the field decreases with distance from the wire.

Where the marks are

  • Correct pattern/diagram for first shape of conductor (1 mark)
  • Correct pattern/diagram for second shape of conductor (1 mark)
  • Identifies point X (½ mark)
  • Reason: field decreases with increasing distance from wire (½ 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 31/1/1: 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.