A lightweight, metal-coated sphere is suspended from an insulating thread. When a positively charged rod is brought near to (but does not touch) the sphere, the sphere is attracted towards the rod.
What can be concluded about the charge on the sphere?
It must have a negative charge.
It must have a positive charge.
It could be negatively charged or neutral.
It could be positively charged or neutral.
145 exam-style questions on CIE IGCSE Physics 4.2.1a Positive and negative charge. Each one has a worked solution and a mark scheme showing where the marks go.