Two identical balloons are initially neutral. Each balloon gains electrons when rubbed with dry hair. The balloons are suspended close together without touching. What happens?
They move apart because both balloons are positive.
They move apart because both balloons are negative.
They move together because both balloons are positive.
They move together because both balloons are negative.
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.