Three small charged spheres P, Q and R are tested in pairs without touching. P repels Q. Q attracts R. P is negatively charged. Which statement is correct?
Q is positive and R is positive.
Q is positive and R is negative.
Q is negative and R is negative.
Q is negative and R is 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.