A metal drum standing on a rubber mat has become negatively charged. The drum is then connected to earth by a copper wire.
Which statement describes what happens to the drum while it is connected?
Protons move from earth to the drum until the drum is neutral.
Electrons move from the drum to earth until the drum is neutral.
Electrons move from earth to the drum until the drum is neutral.
Protons move from the drum to earth until the drum is neutral.
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.