Uses of static electricity
2 marks · EasyExplain why a bicycle frame is connected to an electrical supply during electrostatic paint spraying.
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The frame is given an opposite charge to the paint droplets so the paint is attracted to it.
Also accept: To make the paint stick to the frame by opposite charges attracting.
Common mistakes: Saying 'to avoid shocks' or confusing with grounding.; Not mentioning charge or attraction.
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Marking points
B1 · 1 mark · States the frame gets an opposite charge to the paint.
B2 · 1 mark · States this causes attraction between paint and frame.
Worked solution
The bicycle frame is given a charge opposite to that of the droplets. This means the paint is attracted and sticks to the frame, covering all areas.