CAIE IGCSE Physics 4.2.1.1 There are positive & negative
Practise recognising that electric charge comes in two types, positive and negative, when describing charged objects and simple observations.
- Syllabus
- 2026–2028
- Course
- Physics 0625
4.2.1.1—There are positive and negative question 1
A lightning conductor protects a tall building and the people in it against damage and injury caused by lightning strikes.
The lightning conductor is a very long strip of copper that is attached to the side of the building. At the top of the building, the strip of copper is connected to a vertical metal pole and at the bottom of the building, it is buried in the ground.
Fig. 7.1
The bottom of the thundercloud is negatively charged.
As the cloud moves closer to the building, the top of the metal pole becomes charged.
State the sign of the charge at the top of the metal pole. Explain, in terms of the particles involved, how it becomes charged.
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