O-LevelPhysicsElectricity5054/11 · Oct/Nov 2025 · 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
A: magnitude of charge on cloth equal to Q sign of charge on cloth positive type of force attraction
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