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A point charge situated at a… (Class 12 Physics 2023, Q1)

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PhysicsCBSE Class 12 · Board exam 2023, set 55/1/1 · 1 mark · MCQ

CBSE Class 12 Physics 2023: question 1

Set in the CBSE Class 12 board exam of 2023, paper 55/1/1, section A, question 1, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q1 · 1 mark · MCQElectric Charges and Fields

A point charge situated at a distance 'r' from a short electric dipole on its axis, experiences a force . If the distance of the charge is '2r', the force on the charge will be :

  1. (A)
  2. (B)
  3. (C)
  4. (D)

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 55/1/1.

Hints

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

Hint 1

How does the field of a dipole fall off with distance?

Hint 2

The axial field varies as . Double and see what happens.

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. On the axis of a short dipole, , so the force on the charge is .

    ½ mark

  2. When the distance becomes : . This is option (B).

    ½ mark

Answer: , option (B)

Where the marks are

  • Uses on the axis and gets (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Electric Charges and Fields, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 55/1/1: 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.