From your understanding of charge as explained in S104 Book 3 explain how the process works and hence why this is a very efficient way of spraying compared with normal spray painting (with no charge). Include in your answer explanations as to:
why a voltage difference must be applied to the system of the nozzle and the article during the painting process
the electrical property that the surface of the article to be painted must have.
We expect you will be able to answer all of part (a) in about 160 words.
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