Exam-style question
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Using Coulomb's law, calculate the force between two charges of +3 µC and +5 µC separated by a distance of 0.1 m. (Use k = 8.99 x 10^9 N m²/C²) Scenario focus: inverse-square reasoning in a distinct A-Level Physics fields context; identify the field quantity, source, direction, and unit before selecting the answer.
Model answer
What a good answer should say
- The force between the charges is 134.85 N.
Explanation
Why this works
The correct answer is The force between the charges is 134.85 N.. This is correct for Electric fields because the stem is testing inverse-square reasoning; the chosen option keeps the field quantity, source interaction, direction, and unit consistent.
The alternatives are weaker because they mix gravitational, electric, magnetic, orbital, or transformer ideas, or they attach the right number to the wrong physical meaning.
Common mistake
No common mistake is linked to this question yet.