Two metal work surfaces, A and B, are each connected separately to Earth. Electrons flow from surface A to Earth, while electrons flow from Earth to surface B. What were the charges on the surfaces before they were connected?
Surface A was positive and surface B was negative.
Surface A was negative and surface B was negative.
Surface A was negative and surface B was positive.
Surface A was positive and surface B was positive.
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.