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Strength of magnetic field… (Class 10 Science 2024, Q16)

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ScienceCBSE Class 10 · Board exam 2024, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 16

Set in the CBSE Class 10 board exam of 2024, paper 31/2/1, section A, question 16, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q16 · 1 mark · MCQMagnetic Effects of Electric Current

Strength of magnetic field produced by a current carrying solenoid DOES NOT depend upon :

  1. (A)number of turns in the solenoid
  2. (B)direction of the current flowing through it
  3. (C)radius of solenoid
  4. (D)material of core of the solenoid

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/2/1.

Hints

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

Hint 1

Which factor changes only the direction of the field?

Hint 2

Think about what happens to the N and S poles when the current is reversed.

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. The strength of the field depends on the number of turns, the current, the radius and the core material.

    ½ mark

  2. Reversing the current only reverses the direction of the field, not its strength. Option (B) is correct.

    ½ mark

Answer: Direction of current: option (B)

Where the marks are

  • Selects option (B) (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 paper2024 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.