A negatively charged metal sphere is connected to Earth. After it becomes neutral, the connection is left in place. No other charged objects are nearby. Which statement correctly describes the transfer of electrons?
Electrons initially leave the sphere; transfer continues until it becomes positive.
Electrons initially leave the sphere; there is then no further net transfer.
Electrons initially enter the sphere; there is then no further net transfer.
Electrons initially enter the sphere; transfer continues until it becomes 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.