Question 9
HCar body panels can be painted with an electrostatic paint sprayer.
The paint droplets become positively charged as they leave the nozzle of the sprayer. The car panel is given a negative charge.
The Figure shows the sprayer and the car panel.
Figure
a.[2]
Explain why the paint droplets spread out into a wide, even cloud after they leave the nozzle.
b.[2]
Explain, using the idea of an electric field, why the paint droplets move towards the car panel.
c.[1]
Suggest one advantage of using charged paint droplets instead of uncharged paint droplets.
d.[1]
Suggest why the car panel must be made of a conducting material for this method to work well.
3.1 Static and charge Questions
43 exam-style questions on OCR GCSE Physics 3.1 Static and charge, covering 3.1.1 Positive and negative charge, 3.1.2 Static electricity and forces between charged objects, 3.1.3 Electron transfer and static electricity, 3.1.4 Electric fields, 3.1.5 Current as a flow of charge, 3.1.6 Current in a single closed loop, and 3.1.7 Charge, current and time. Each one has a worked solution and a mark scheme showing where the marks go.