Uses of static electricity
2 marks · EasyDescribe how static electricity can help remove dust from the air in some factories.
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Charged plates in the air attract oppositely charged dust particles, causing them to stick to the plates and be removed from the air.
Also accept: Air is passed through charged plates; the particles become charged and stick to the plates.
Common mistakes: Saying the dust just falls down without mentioning the charge.; Giving an unrelated use of static electricity.
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Marking points
B1 · 1 mark · Mentions that dust particles become charged as air passes through.
B2 · 1 mark · States that charged dust is attracted and sticks to oppositely charged plates.
Worked solution
Dust particles pass through charged plates and become charged. The plates have an opposite charge, so the dust particles are attracted to the plates, where they stick and can be removed.