A student explains that a charged rod can move a charged ball without touching it because the field of the rod reaches the ball. Which addition makes the explanation complete?
The field of the rod becomes stronger the further away the ball sits
The field of the rod acts on the ball only while the rod is rubbed
The field of the rod acts on the ball only if the ball has no charge
The ball is charged, so it feels a force when it sits in that field
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.