Question 5
Dust removal from air can be achieved by means of an electric field. When air
containing dust particles passes through a fine wire mesh, the particles become
negatively charged. Subsequently, the air is directed between two positively
charged metal plates, where the charged dust particles are attracted and collected,
as illustrated in the figure below.
a. Explain how the dust particles become negatively charged when they pass
through the wire mesh. [2 marks]
b. Explain what happens to the dust particles as they pass through the electric
field. [2 marks]
c. Complete the diagram to show the electric field between two dust particles
before they entered the electric field. Use three arrows to show the
behavior of the particles. [1 marks]
containing dust particles passes through a fine wire mesh, the particles become
negatively charged. Subsequently, the air is directed between two positively
charged metal plates, where the charged dust particles are attracted and collected,
as illustrated in the figure below.
a. Explain how the dust particles become negatively charged when they pass
through the wire mesh. [2 marks]
b. Explain what happens to the dust particles as they pass through the electric
field. [2 marks]
c. Complete the diagram to show the electric field between two dust particles
before they entered the electric field. Use three arrows to show the
behavior of the particles. [1 marks]