Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Electric Charge
74 practice questions
Topics covered
Practice questions
41–50 of 74
Question 41
2 marks · Normal
Answer and see the solution →Inkjet printers use static electricity to control where drops of ink land on the paper. Explain how electrostatic forces help form the image on the paper.
Question 42
2 marks · Normal
Answer and see the solution →A plastic rod is charged and held near a thin stream of water from a tap. Describe what happens to the stream, and explain why this occurs.
Question 43
1 mark · Normal
Answer and check →Which process best describes how static electricity is used in inkjet printers?
- A.Charged ink drops are directed by electrostatic forces onto the paper.
- B.Ink is magnetised to stick to the paper.
- C.Electric current heats the ink drops.
- D.A laser is used to fix the ink onto the paper.
Question 44
4 marks · Normal
Answer and see the solution →A factory uses an electrostatic method to spray powder onto plastic objects.
(a)[1 mark]State what charge should be given to the powder and to the plastic objects to ensure the powder is attracted to the objects.
(b)[3 marks]Explain how electrostatic forces help the powder to coat all parts of the plastic objects, even on surfaces that are hard to reach.
Question 45
2 marks · Normal
Answer and see the solution →State and explain one reason why electrostatic spraying reduces waste compared to ordinary spraying.
Question 46
1 mark · Normal
Answer and check →Which statement best describes how static electricity helps electrostatic paint spraying?
- A.Paint droplets get a charge so they are attracted to the oppositely charged object.
- B.Paint is made magnetic to stick better.
- C.The object is heated to attract the paint.
- D.A fan spreads paint evenly on the surface.
Question 47
2 marks · Normal
Answer and see the solution →Explain why paint droplets from an electrostatic spray gun spread out from each other as they leave the nozzle.
Question 48
4 marks · Normal
Answer and see the solution →In a factory, car doors are painted using electrostatic spraying.
(a)[2 marks]Describe how charges are arranged in the spray gun and on the car door during the process.
(b)[2 marks]Explain, using physics ideas, how electrostatic spraying improves the efficiency of painting compared to uncharged methods.
Question 49
3 marks · Normal
Answer and see the solution →Describe, using ideas about static electricity, how static charges are used in photocopiers.
Question 50
4 marks · Normal
Answer and see the solution →A conveyor belt moves grains past a metal plate. The grains rub the belt and become charged.
(a)[2 marks]Describe what happens if the grains are negatively charged and the metal plate is earthed.
(b)[2 marks]Explain how static electricity can be used to separate the grains from unwanted materials (chaff) using a charged conveyor and earthed plate.