Exam-style question
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State Coulomb's law and explain how it demonstrates the inverse-square behaviour for point charges.
Model answer
What a good answer should say
- Coulomb's law states that the force between two point charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them.
- This means that as the distance between the charges increases, the force decreases by the square of that distance, illustrating the inverse-square relationship.
Explanation
Why this works
This answer is strong because it accurately defines Coulomb's law and explains the inverse-square relationship, which is a key concept in understanding electric forces. The question tests the student's ability to recall and apply fundamental physics principles.
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