A student investigates electrostatic charge using a balloon and a cloth. The balloon and cloth are initially uncharged. The student rubs the balloon with the cloth. The balloon gains a negative charge of magnitude Q. The cloth becomes charged and a force acts between the balloon and the cloth. Which row correctly describes the magnitude and sign of the charge on the cloth and the type of force between the balloon and the cloth?
✓ Correct Answer
The correct answer is A: magnitude of charge on cloth equal to Q sign of charge on cloth positive type of force attraction
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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