A student holds a metal rod in their bare hand and rubs it with a dry cloth. The metal rod does not become charged. What is the best explanation?
Metals have no electrons that can be rubbed off by a cloth
The cloth gains electrons from the rod and then loses them
Metal rods are too smooth for any rubbing to take place
Charge flows through the student to earth, so none is left
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.