When a car is driven, friction between the car body and the air causes the metal car body to become negatively charged.
The car tyres are made of rubber.
Explain why the charge cannot flow from the car body to the ground while the car is moving.
A passenger steps out of the car onto the ground and touches the metal car door.
The passenger feels an electric shock.
Explain why.
In one shock, a charge of 1.2 μC1.2\ \mu\text{C}1.2 μC flows through the passenger in 3.0 μs3.0\ \mu\text{s}3.0 μs.
Calculate the average current in the passenger.
Some cars have a conducting strip that touches the road.
Explain how the strip stops the passenger getting an electric shock.
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.