A metal trolley has an overall negative charge. It is connected to Earth using a copper cable.
Explain the direction of electron movement while the trolley is connected to Earth, and how the direction would differ if the trolley instead had an overall positive charge.
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.