Grain dust is blown through four identical sections of metal ducting. Charge is separated as the dust rubs against the inside of the ducting. The table shows the dust speed in each section and whether that section is connected to earth through a conductor.
| Section | Dust speed | Connected to earth through a conductor |
|---|---|---|
| 1 | 10 m/s | Yes |
| 2 | 6 m/s | No |
| 3 | 4 m/s | Yes |
| 4 | 8 m/s | No |
Which section of ducting has the greatest risk of a spark forming?
Section 2
Section 4
Section 1
Section 3
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.