To calibrate an electrostatic field mill sensor, a laboratory technician needs to generate a net static electric charge on a handheld polytetrafluoroethylene (PTFE) block.
Describe one practical method the technician can use to give the PTFE block an overall electric charge.
47 exam-style questions on Edexcel GCSE Physics 11.1 Charging by friction. Each one has a worked solution and a mark scheme showing where the marks go.