An electrostatic spray-painting system must make droplets repel one another and attract a negatively charged panel.
The table shows four possible settings.
| Setting | Charges on droplets |
|---|---|
| P | All positive |
| Q | All negative |
| R | Equal numbers positive and negative |
| S | All uncharged |
Which setting meets both requirements?
Q only
R only
P only
S only
80 exam-style questions on Edexcel GCSE Physics 11.2 Uses, dangers and electric fields, covering 11.2.1 Uses of electrostatic charge, 11.2.2 Dangers of sparking, 11.2.3 Electric fields, and 11.2.4 Electric fields and static electricity. Each one has a worked solution and a mark scheme showing where the marks go.