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Name the device used to… (Class 10 Science 2024, Q25b)

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ScienceCBSE Class 10 · Board exam 2024, set 31/3/1 · 2 marks · Very short answer

CBSE Class 10 Science 2024: question 25(b)

Set in the CBSE Class 10 board exam of 2024, paper 31/3/1, section B, question 25(b), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q25(b) · 2 marks · Very short answerMagnetic Effects of Electric Current

Name the device used to magnetise a piece of magnetic material. Draw a labelled diagram to show the arrangement used for the magnetisation of a cylinder made of soft iron.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/3/1.

Hints

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

Hint 1

Which coil arrangement produces a uniform magnetic field inside it?

Hint 2

Place the soft iron inside that coil and pass current; what do you get?

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. Device: A current-carrying solenoid is used. When a soft iron piece is placed inside it, it forms an electromagnet.

    ½ mark

  2. Diagram: Draw a soft iron cylinder (rod). Wind a coil of many turns of insulated copper wire closely around it, forming a solenoid. Connect the ends of the coil in series with a battery and a plug key K. Show the direction of current with arrows.

    1 mark

  3. Labels: soft iron rod, current-carrying solenoid (coil), battery, key. When the key is closed, the strong magnetic field inside the solenoid magnetises the soft iron.

    ½ mark

Answer: Current-carrying solenoid (electromagnet). The soft iron cylinder is placed inside a coil connected to a battery and key.

Where the marks are

  • Names solenoid/electromagnet (½ mark)
  • Diagram of coil wound on soft iron rod connected to battery and key (1 mark)
  • Correct labelling (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 paper2024 board paper, set 31/3/1: 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.