Electric Potential Energy Practice Questions

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The following physics revision questions are provided in support of the physics tutorial on Electric Potential Energy. In addition to this tutorial, we also provide revision notes, a video tutorial, revision questions on this page (which allow you to check your understanding of the topic) and calculators which provide full, step by step calculations for each of the formula in the Electric Potential Energy tutorials. The Electric Potential Energy calculators are particularly useful for ensuring your step-by-step calculations are correct as well as ensuring your final result is accurate.

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Electrostatics Learning Material

Tutorial ID	Title	Tutorial	Video Tutorial	Revision Notes	Revision Questions
14.4	Electric Potential Energy

Physics Revision Questions for Electric Potential Energy

1) What is the speed by which an electron initially at rest at position 1 as shown in the figure hits the plate at the position 2? Take the mass of electron equal to 9.1 × 10^-31 kg and the charge of electron equal to - 1.6 × 10^-19 C.

1. 2.81 × 10⁷ m/s
2. 2.56 m/s
3. 2.56 × 10⁷ m/s
4. 1.68 × 10⁷ m/s

Reveal AnswerCorrect Answer: D

2) Two charges Q₁ = 40 μC and Q₂ = 20 μC are placed at a distance r from each other. What is this distance if the electric potential energy of the system of charges is 3 J?

1. 2.4 m
2. 2.4 cm
3. 27 cm
4. 2.7 m

Reveal AnswerCorrect Answer: A

3) What is the electric potential energy of the system of charges shown in the figure in terms of Q and r?

1. 12kQ₂/r
2. 14kQ₂/r
3. 17kQ₂/rV
4. 11kQ₂/r

Reveal AnswerCorrect Answer: C

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5. Continuing learning electrostatics - read our next physics tutorial: Electric Potential

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