O-LevelPhysicsElectricityOct/Nov 2025Paper 1 Q281 Mark
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?
Amagnitude of charge on cloth
equal to Q
sign of charge on cloth
positive
type of force
attraction
Bmagnitude of charge on cloth
equal to Q
sign of charge on cloth
negative
type of force
repulsion
Cmagnitude of charge on cloth
greater than Q
sign of charge on cloth
positive
type of force
repulsion
Dmagnitude of charge on cloth
greater than Q
sign of charge on cloth
negative
type of force
attraction
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of electricity within the Physicssyllabus. The examiner's mark scheme requires...
📋 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...
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