A student charges a plastic rod by rubbing one end of it with a cloth. The charge stays on that end and does not spread along the rod. Why does the charge stay in one place?
The charge is held in place by the field of the rubbing cloth
The charge is far too small to be able to move along the rod
Plastic is an insulator, so the charge cannot flow through it
The other end of the rod already carries an equal charge
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.