PhysicsCBSE Class 12 · Sample paper, session 2024-25 · 1 mark · MCQ

CBSE Class 12 Physics sample paper 2024-25: question 1

From the official CBSE sample question paper for 2024-25, section A, question 1, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q1 · 1 mark · MCQElectrostatic Potential and Capacitance

A uniform electric field pointing in positive X-direction exists in a region. Let A be the origin, B be the point on the X-axis at x = +1 cm and C be the point on the Y-axis at y = +1 cm. Then the potential at points A, B and C satisfy.

(A) $V_{A} < V_{B}$
(B) $V_{A} > V_{B}$
(C) $V_{A} < V_{C}$
(D) $V_{A} > V_{C}$

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

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

Hint 1

How does potential change as you move along the field direction?

Hint 2

Movement perpendicular to the field does not change potential.

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.

The electric potential falls along the direction of the field. B lies 1 cm from A along +X, so $V_{B} = V_{A} - E (0.01)$ , which gives $V_{A} > V_{B}$ .
½ mark
C lies on the Y-axis, perpendicular to the field, so A and C are on the same equipotential: $V_{A} = V_{C}$ . Options (C) and (D) are therefore wrong, and the answer is (B).
½ mark

Answer: $V_{A} > V_{B}$ , option (B)

Where the marks are

Potential decreases along the field, so $V_{A} > V_{B}$ (0.5 mark)
$V_{A} = V_{C}$ , giving option (B) (0.5 mark)

Revise the chapter

Chapter: Electrostatic Potential and Capacitance (notes, formulas, where marks are lost and every past question)

Practise this chapterBoard-style questions from Electrostatic Potential and Capacitance, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2024-25: every question, by section.

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CBSE Class 12 Physics sample paper 2024-25: question 1

Hints

Step-by-step solution

Revise the chapter

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