Question 8
FA student rubs a balloon on a woollen jumper.
The balloon becomes negatively charged.
The student holds the balloon against a wall and lets go. The balloon sticks to the wall.
The Figure shows the balloon on the wall.
Figure
a.[2]
Explain how the balloon becomes negatively charged when it is rubbed on the jumper.
b.[3]
The wall was uncharged before the balloon was placed on it.
Explain why the balloon sticks to the wall.
Use the Figure in your answer.
c.[1]
Give the type of charge on the jumper after it has been rubbed with the balloon.
d.[2]
After some time, the balloon falls off the wall.
Suggest why.
11.1 Charging by friction Questions
91 exam-style questions on Edexcel GCSE Physics 11.1 Charging by friction, covering 11.1.1 Charging insulators by friction, 11.1.2 Forces between charges, 11.1.3 Electrostatic phenomena, and 11.1.4 Earthing and removing charge. Each one has a worked solution and a mark scheme showing where the marks go.