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(i) Draw a diagram, showing… (Class 10 Science 2026, Q39B)

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ScienceCBSE Class 10 · Board exam 2026, set 31/5/1 · 5 marks · Long answer

CBSE Class 10 Science 2026: question 39(B)

Set in the CBSE Class 10 board exam of 2026, paper 31/5/1, section C, question 39(B), for 5 marks. Try it first; the hints and our step-by-step solution are below.

Q39(B) · 5 marks · Long answerMagnetic Effects of Electric Current

(i) Draw a diagram, showing the magnetic field lines in and around the current carrying solenoid. Write any two salient features of these lines.
(ii) What is an electromagnet and how is it made ?

  1. (i)

    Draw a diagram, showing the magnetic field lines in and around the current carrying solenoid. Write any two salient features of these lines.

    0 marks
  2. (ii)

    What is an electromagnet and how is it made ?

    0 marks

Figure in the paper: Diagram of a current-carrying solenoid showing magnetic field lines inside the coil running parallel and nearly uniform, and lines outside looping from one end back to the other, like a bar magnet. See it in the official paper.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/5/1.

Hints

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

Hint 1

Compare the solenoid's field pattern with a magnet you already know.

Hint 2

What do parallel straight lines inside the coil tell you about the field?

Hint 3

Which core material is magnetised strongly but only temporarily?

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. (i) Diagram: Draw a solenoid (coil of many turns) connected to a battery and key. Inside the coil draw parallel straight field lines with arrows; outside, draw lines looping from one end to the other, like a bar magnet; mark the ends N and S as per the current direction.

    1 mark

  2. Feature 1: The field pattern of a current-carrying solenoid is similar to that of a bar magnet; one end behaves as north pole and the other as south pole.

    1 mark

  3. Feature 2: Inside the solenoid the field lines are parallel straight lines, showing that the magnetic field is uniform there.

    1 mark

  4. (ii) An electromagnet is a piece of magnetic material (soft iron) that behaves as a strong magnet only while electric current flows through a coil around it.

    1 mark

  5. It is made by winding insulated copper wire as a coil (solenoid) around a soft iron core and passing current through the coil; the soft iron gets magnetised.

    1 mark

Answer: (i) Diagram; field like a bar magnet, parallel straight lines (uniform field) inside; (ii) electromagnet = soft iron magnetised by current in coil, made by winding insulated copper wire around soft iron core

Where the marks are

  • Correct diagram of solenoid field lines with directions (1 mark)
  • Any two salient features (1 + 1 marks)
  • Definition of electromagnet (1 mark)
  • How it is made: insulated copper coil on soft iron core with current (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 31/5/1: 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.