Two small spheres each have a negative charge. Which statement describes the electrostatic force between them?
They attract because their charges have the same sign.
They repel because their charges have opposite signs.
They repel because their charges have the same sign.
They attract because their charges have opposite signs.
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.