A plastic rod is rubbed with a dry cloth and becomes charged. The rod is then rubbed again in the same place with the same cloth. What is the most likely effect on the rod?
The charge on the rod increases, because more electrons transfer
The charge on the rod decreases, because electrons transfer back
The charge on the rod stays the same, because the rod is full
The charge on the rod changes sign, because rubbing reverses it
40 exam-style questions on AQA GCSE Physics 2.5 Static electricity, covering 2.5.1 Static charge and 2.5.2 Electric fields. Each one has a worked solution and a mark scheme showing where the marks go.