Some agricultural crop sprayers give pesticide droplets a negative charge as they exit the nozzle.
The pesticide droplets have a negative charge because the sprayer
adds protons to the pesticide droplets
removes protons from the pesticide droplets
adds electrons to the pesticide droplets
removes electrons from the pesticide droplets
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.