A student rubs an acetate rod with a dry cloth. The student says that rubbing has made new positive charge on the rod. Why is the student wrong?
Rubbing removes positive charge from the surface of the rod
Rubbing can only ever make new negative charge on the rod
The rod was already positively charged before it was rubbed
Rubbing only moves electrons, so no new charge is created
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.