CIE iGCSE Co-Ordinated Science P4.2.1 Electrical charge Exam Style Questions Paper 2
▶️ Answer/Explanation
Ball P is negative and repels ball Q, so Q must also be negatively charged (like charges repel).
Ball Q is negative and attracts ball R, so R must have the opposite (positive) charge (unlike charges attract).
This gives Q as negative and R as positive.
✅ Answer: (B)
Ball Q is negative and attracts ball R, so R must have the opposite (positive) charge (unlike charges attract).
This gives Q as negative and R as positive.
✅ Answer: (B)
▶️ Answer/Explanation
Charging by friction always involves the transfer of electrons, never protons, since protons are fixed in the nucleus.
If the rod becomes positively charged, it must have lost electrons to the cloth, leaving an excess of positive charge on the rod.
✅ Answer: (B)
If the rod becomes positively charged, it must have lost electrons to the cloth, leaving an excess of positive charge on the rod.
✅ Answer: (B)
▶️ Answer/Explanation
Charging by friction only ever transfers \(e^-\); protons are fixed in the nucleus and cannot move between materials.
For repulsion, both objects need like charges — if both lose the same number of electrons to the cloth, both become equally \(+\)vely charged.
✅ Answer: (C)
For repulsion, both objects need like charges — if both lose the same number of electrons to the cloth, both become equally \(+\)vely charged.
✅ Answer: (C)
▶️ Answer/Explanation
Charging by friction always involves the transfer of electrons, since protons are held tightly within the nucleus and cannot move between materials.
If the rod ends up positively charged, it must have lost negative charge overall.
This happens because electrons move from the rod to the cloth, leaving the rod with an excess of positive charge.
✅ Answer: (B)
If the rod ends up positively charged, it must have lost negative charge overall.
This happens because electrons move from the rod to the cloth, leaving the rod with an excess of positive charge.
✅ Answer: (B)
▶️ Answer/Explanation
Electrons are transferred away from the hair and onto the balloon, so the hair loses negative charge and the balloon gains it.
Losing electrons leaves the hair with an overall positive charge, while gaining electrons leaves the balloon with an overall negative charge.
This gives hair positive and balloon negative, matching row C, consistent with the two becoming oppositely charged and therefore attracted to each other.
✅ Answer: (C)
Losing electrons leaves the hair with an overall positive charge, while gaining electrons leaves the balloon with an overall negative charge.
This gives hair positive and balloon negative, matching row C, consistent with the two becoming oppositely charged and therefore attracted to each other.
✅ Answer: (C)