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If a charged hollow… (Class 12 Physics SQP 2025-26, Q1)

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PhysicsCBSE Class 12 · Sample paper, session 2025-26 · 1 mark · MCQ

CBSE Class 12 Physics sample paper 2025-26: question 1

From the official CBSE sample question paper for 2025-26, 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

If a charged hollow sphere and a solid sphere of aluminum and copper of equal radii are in electrostatic equilibrium, then which of the following statements is true?

  1. (A)Both the spheres are having equal charges.
  2. (B)The hollow sphere will have more charge than solid sphere at its surface.
  3. (C)The aluminum sphere will have more charge on its surface than copper sphere.
  4. (D)If hollow sphere is also made up of aluminum then it will have more charge.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2025-26.

Hints

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

Hint 1

What is common to two conductors in electrostatic equilibrium?

Hint 2

Does the capacitance of a sphere depend on its material or on whether it is hollow?

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. In electrostatic equilibrium after contact, both conductors are at the same potential .

  2. For an isolated sphere . This depends only on the radius, not on whether the sphere is hollow or solid, or on its material.

  3. Equal radii give equal , so is the same for both. Option (A).

    1 mark

Answer: Option (A): both spheres carry equal charges.

Where the marks are

  • Uses equal potential and to conclude the charges are equal (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 paperSample paper 2025-26: 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.