# Coulomb's Law Practice Questions

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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Notes
Revision
Questions
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

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

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

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4. Check your calculations for Electrostatics questions with our excellent Electrostatics calculators which contain full equations and calculations clearly displayed line by line. See the Electrostatics Calculators by iCalculator™ below.
5. Continuing learning electrostatics - read our next physics tutorial: Electric Field