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CAIE IGCSE Physics 4.2.1.2 Positive Charges Repel Other Positive Questions

Learn how charge sign and redistribution determine electrostatic attraction and repulsion, and apply these rules to charged rods, plates and spheres in exam diagrams.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • Use a rod or sphere diagram to decide whether like charges repel or unlike charges attract, explain motion after contact with a plate by linking the new charge to attraction or repulsion, and interpret charge-distribution diagrams for nearby charged metal spheres or objects.

CAIE IGCSE Physics 4.2.1.2 Positive Charges Repel Other Positive Questions question 1

[Maximum number: 2]

Fig. 9.1 shows a conducting ball that oscillates between two charged plates.

Fig. 9.1

Fig. 9.1

As the ball oscillates, it touches each plate in turn.

Referring to the charge on the ball, explain why the ball moves to the positive plate after touching the negative plate.

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