Coulomb's Law Practice Questions

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The following physics revision questions are provided in support of the physics tutorial on Coulomb's Law. 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 Coulomb's Law tutorials. The Coulomb's Law 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
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14.2Coulomb's Law

Physics Revision Questions for Coulomb's Law

1) Two positive charges Q1 = 2.0 μC and Q2 are placed 4.0 m away from each other. As a result, a 0.008 N electrostatic force is produced between them. What is the magnitude of the charge Q2 in micro Coulombs?

  1. 1.8 μC
  2. 14.2 μC
  3. 3.5 μC
  4. 7.1 μC

Correct Answer: D

2) Three electric charges Q1 = 6 μC, Q2 = 1 μC and Q3 = 3 μC are collinear, as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Coulomb's Law

What is the magnitude of electrostatic force actin on Q3?

  1. 10-2 N
  2. 0.625 × 10-3 N
  3. 3.125 × 10-3 N
  4. 5.625 × 10-3 N

Correct Answer: C

3) Three electric charges are placed at the vertices of a right triangle as shown in the figure below.

Physics Tutorials: This image provides visual information for the physics tutorial Coulomb's Law

What is the magnitude of resultant force acting on Q1 if the charges are: Q1 = 3 μC, Q2 = - 6 μC and Q3 = - 2 μC?

  1. 11.8 × 10-3 N
  2. 16.1 × 10-3 N
  3. 10.1 × 10-3 N
  4. 6.0 × 10-3 N

Correct Answer: A

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

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